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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Non-Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 1,160.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |  | $ 709.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |  | $ 1,066.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |  | $ 523.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Assets |  |  |  |  |  |  |
Cash and cash equivalents | 1,311.4 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 1,293.8 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 1,319.2 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 1,899.7 us-gaap_CashAndCashEquivalentsAtCarryingValue
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 306.2 us-gaap_DerivativeAssets |  |  |  | 296.3 us-gaap_DerivativeAssets |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Asset-backed loans | 791.9 hrg_AssetBackedLoansAndOtherInvestedAssets |  |  |  | 811.6 hrg_AssetBackedLoansAndOtherInvestedAssets |  |
Other invested assets | 247.0 hrg_OtherInvestedAssets |  |  |  | 165.0 hrg_OtherInvestedAssets |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 |  | 0.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 11.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss |  | (6.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 92.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases |  | 192.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (3.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements |  | (0.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | (5.9)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet | [1] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 2,636.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  | 2,172.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  | 2,059.4 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  | 1,875.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | 230.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings |  | 146.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | 346.9 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases |  | 150.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | (0.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet |  |  |  |
Asset-backed Securities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 34.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 9.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 37.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 5.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | (0.2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 3.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  | 5.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | (5.9)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [1] |  |  | (5.9)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [1] |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 120.4 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  | 6.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  | 83.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  | 5.7 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  | 0.3 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 36.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (0.3)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  |  |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 907.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | 607.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | 850.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | 461.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | (0.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 8.4 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | (6.1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 51.9 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | 152.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (2.6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | (0.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |
Hybrids [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 34.3 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | (0.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 35.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember |  |  |  |
Municipals [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 38.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  | 37.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 1.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (0.2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |  |  |  |  |  |
Held for trading [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_EquitySecuritiesClassifiedAsHeldForTradingMember |  |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 6.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 10.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 6.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 10.7 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | [1] | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | [1] |  |  |
Nomura Fund Linked Note [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 11.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NomuraFundLinkedNoteMember |  |  |  | 11.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NomuraFundLinkedNoteMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  | [1] |  |  |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  |  |  |  |  |
Other Invested Assets [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Trading Securities |  |  |  |  | 165.0 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember |  |
Level 2 [Member] |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Total debt | 5,842.6 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [2] |  |  | 5,308.5 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [2] |
Level 3 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Asset-backed loans | 791.9 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |  | 151.7 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 13,442.9 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |  | 13,108.8 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Level 3 [Member] | Policy loans [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | 233.2 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_PolicyLoansMember |  |  |  | 811.6 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_PolicyLoansMember |  |
Recurring [Member] |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 2,643.9 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 2,062.2 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Funds Withheld Receivable | 512.6 hrg_FundsWithheldReceivable / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 154.4 hrg_FundsWithheldReceivable / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Assets, Fair Value Disclosure, Recurring | 19,307.1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 18,501.7 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 583.6 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 296.0 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  |  |  |  | 12.8 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 2.6 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0.4 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Commodity Option [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 19.9 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 3.2 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 0.9 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0.5 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Call options [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 306.2 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 296.3 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Equity securities - available-for-sale | 625.9 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 663.6 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 2,140.2 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 1,908.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Future Contracts [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 1.9 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FutureContractsMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |  |
Recurring [Member] | Interest Rate Contract [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 0.6 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0.6 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 1.9 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 1.8 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 1,839.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [3] |  |  | 1,792.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [3] |
Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 668.4 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [3] |  |  | 636.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [3] |
Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 9,721.4 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [3] |  |  | 9,795.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [3] |
Recurring [Member] | Hybrids [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 1,301.5 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [3] |  |  | 1,316.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [3] |
Recurring [Member] | Municipals [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 1,361.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [3] |  |  | 1,259.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [3] |
Recurring [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 2,201.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | [3] |  |  | 2,114.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | [3] |
Recurring [Member] | Equity [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Trading Securities | 91.5 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_EquityMember | [3] |  |  | 104.5 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_EquityMember | [3] |
Recurring [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets | 13.8 hrg_OtherInvestedAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember |  |  |  | 13.3 hrg_OtherInvestedAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Total financial assets | 1,311.4 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 1,319.2 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | 0 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 0 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Liabilities, Fair Value Disclosure, Recurring | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Funds Withheld Receivable | 0 hrg_FundsWithheldReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0 hrg_FundsWithheldReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Assets, Fair Value Disclosure, Recurring | 550.2 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 279.3 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 1 [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 401.6 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 115.6 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 1 [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Equity securities - available-for-sale | 57.1 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 59.2 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 1 [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 1,311.4 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember |  |  |  | 1,319.2 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | [3] |
Recurring [Member] | Level 1 [Member] | Equity [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Trading Securities | 91.5 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_EquityMember | [3] |  |  | 104.5 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_EquityMember | [3] |
Recurring [Member] | Level 1 [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets | 0 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember |  |  |  | 0 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember |  |
Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Total financial assets | 0 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 0 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | 5,842.6 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 5,308.5 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Liabilities, Fair Value Disclosure, Recurring | 7.3 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 2.8 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Funds Withheld Receivable | 512.6 hrg_FundsWithheldReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 154.4 hrg_FundsWithheldReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Assets, Fair Value Disclosure, Recurring | 17,596.1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 17,156.4 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 182.0 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 180.4 us-gaap_AvailableForSaleSecurities / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Foreign exchange forward agreements [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives |  |  |  |  | 12.8 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 2.6 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0.4 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Commodity Option [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 19.9 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 3.2 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 0.9 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0.5 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityOptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Call options [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 306.2 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 296.3 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Equity securities - available-for-sale | 562.7 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 598.4 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Future Contracts [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 1.9 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FutureContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 0.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FutureContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member] |  |  |  |  |  |  |
Derivatives, Assets |  |  |  |  |  |  |
Derivatives | 0.6 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0.6 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 1.9 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 1.8 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 1,804.5 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [3] |  |  | 1,755.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [3] |
Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 548.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [3] |  |  | 553.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [3] |
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 8,813.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [3] |  |  | 8,945.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [3] |
Recurring [Member] | Level 2 [Member] | Hybrids [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 1,301.5 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [3] |  |  | 1,316.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [3] |
Recurring [Member] | Level 2 [Member] | Municipals [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 1,323.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [3] |  |  | 1,222.6 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [3] |
Recurring [Member] | Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 2,201.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | [3] |  |  | 2,114.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | [3] |
Recurring [Member] | Level 2 [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | [3] |
Recurring [Member] | Level 2 [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets | 2.0 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember | [3] |  |  | 2.1 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember | [3] |
Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Total financial assets | 1,025.1 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 963.3 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | 13,442.9 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 13,108.8 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Liabilities, Fair Value Disclosure, Recurring | 2,636.6 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 2,059.4 us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Funds Withheld Receivable | 0 hrg_FundsWithheldReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 0 hrg_FundsWithheldReceivable / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Assets, Fair Value Disclosure, Recurring | 1,160.8 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 1,066.0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 3 [Member] | Available For Sale Embedded Derivatives [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Equity securities - available-for-sale |  |  |  |  | 6.0 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 3 [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 2,140.2 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 1,908.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 496.4 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 151.3 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 907.6 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [3] |  |  | 850.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [3] |
Recurring [Member] | Level 3 [Member] | Hybrids [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [3] |  |  | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [3] |
Recurring [Member] | Level 3 [Member] | Municipals [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Available-for-sale Securities |  |  |  |  | 37.2 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [3] |
Recurring [Member] | Level 3 [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember |  |  |  | 0 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | [3] |
Contingent Purchase Price Reduction Receivable [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 41.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember |  | 41.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember |  | 41.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember |  | 41.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember |  |  |  |
Contingent Purchase Price Reduction Receivable [Member] | Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 2,140.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  | 1,644.7 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  | 1,908.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  | 1,544.4 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | 232.1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  | 100.3 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet / us-gaap_FairValueByLiabilityClassAxis = hrg_EmbeddedDerivativesIncludedInContractholderFundsMember |  |  |  |
Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 496.4 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  | 149.9 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  | 151.3 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | (1.3)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  | (0.7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | 346.9 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  | 150.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | (0.5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember |  |  |  |  |  |
Equity conversion feature of preferred stock [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  | 378.0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  | 330.8 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  |  | 47.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet / us-gaap_FairValueByLiabilityClassAxis = hrg_EquityConversionFeaturesOfPreferredStockMember |  |  |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Asset-backed loans | 791.9 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |  | 151.7 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Total financial assets | 2,336.5 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Total debt | 5,666.0 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | [2] |  |  | 5,157.8 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | [2] |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 15,019.9 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |  | 14,555.4 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
Financial Liabilities Fair Value Disclosure | 20,685.9 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |  |  |  |
Reported Value Measurement [Member] | Policy loans [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | 233.2 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_PolicyLoansMember |  |  |  | 811.6 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_PolicyLoansMember |  |
Reported Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Total financial assets |  |  |  |  | 2,282.5 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  |  |  |  | 19,713.2 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Reported Value Measurement [Member] | Recurring [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 1,311.4 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember |  |  |  | 1,319.2 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Asset-backed loans | 791.9 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |  | 151.7 hrg_AssetBackedLoansAndOtherInvestedAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Liabilities |  |  |  |  |  |  |
Total debt | 5,842.6 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | [2] |  |  | 5,308.5 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | [2] |
Derivatives, Liabilities |  |  |  |  |  |  |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 13,442.9 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |  | 13,108.8 us-gaap_LiabilitiesRelatedToInvestmentContractsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Estimate of Fair Value Measurement [Member] | Policy loans [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Policy loans and other invested assets | 233.2 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_PolicyLoansMember |  |  |  | 811.6 us-gaap_OtherAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_PolicyLoansMember |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Total financial assets | 2,336.5 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 2,282.5 hrg_AssetsFairValueDisclosureAndMeasurement / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Financial Liabilities Fair Value Disclosure | 19,285.5 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  | 18,417.3 us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Future Contracts [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | 0.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FutureContractsMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |
Derivatives, Liabilities |  |  |  |  |  |  |
Derivative Liability | 496.4 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |  |  | 151.3 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [3] |
Estimate of Fair Value Measurement [Member] | Recurring [Member] | Fixed Maturities [Member] |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 1,311.4 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember |  |  |  | 1,319.2 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | [3] |
Option Pricing [Member] | Recurring [Member] | Level 3 [Member] | Other Invested Assets [Member] | Other Invested Assets [Member] |  |  |  |  |  |  |
Fixed maturity securities, available-for-sale: |  |  |  |  |  |  |
Other invested assets |  |  |  |  | $ 11.2 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_OtherInvestedAssetsMember / us-gaap_ValuationTechniqueAxis = hrg_OptionPricingMember |  |
[1] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmViNzU2N2Q0OTYxMTQyNzFiMTJmYjdjMmM4YTJkM2ZlfFRleHRTZWxlY3Rpb246OUNENEUyQTc3QzdGNTE4MDlDRjNFNjY1RTQyMjIzMUIM}
[2] | (a)
[3] | December 31, 2014 September 30, 2014 Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Fair ValueAssets Contingent purchase price reduction receivable$— $— $41.5 $41.5 $— $— $41.5 $41.5Derivatives: Interest rate contracts— 0.6 — 0.6 — 0.6 — 0.6Commodity swap and option agreements— 19.9 — 19.9 — 3.2 — 3.2Foreign exchange forward agreements— 17.3 — 17.3 — 12.8 — 12.8Call options and futures contracts— 306.2 — 306.2 — 296.3 — 296.3Fixed maturity securities, available-for-sale: Asset-backed securities— 1,804.5 34.6 1,839.1 — 1,755.9 37.0 1,792.9Commercial mortgage-backed securities— 548.0 120.4 668.4 — 553.8 83.1 636.9Corporates— 8,813.8 907.6 9,721.4 — 8,945.8 850.0 9,795.8Hybrids— 1,301.5 — 1,301.5 — 1,316.1 — 1,316.1Municipals— 1,323.1 38.8 1,361.9 — 1,222.6 37.2 1,259.8Residential mortgage-backed securities— 2,201.9 — 2,201.9 — 2,114.0 — 2,114.0U.S. Government401.6 182.0 — 583.6 115.6 180.4 — 296.0Equity securities: Available-for-sale57.1 562.7 6.1 625.9 59.2 598.4 6.0 663.6Trading91.5 — — 91.5 104.5 — — 104.5Other invested assets— 2.0 11.8 13.8 — 2.1 11.2 13.3Funds withheld receivable (a)— 512.6 — 512.6 — 154.4 — 154.4Total financial assets$550.2 $17,596.1 $1,160.8 $19,307.1 $279.3 $17,156.4 $1,066.0 $18,501.7 Liabilities Derivatives: FIA embedded derivatives, included in contractholder funds$— $— $2,140.2 $2,140.2 $— $— $1,908.1 $1,908.1Front Street future policyholder benefit liability— — 496.4 496.4 — — 151.3 151.3Foreign exchange forward agreements and contracts— 2.6 — 2.6 — 0.1 — 0.1Futures contracts— 1.9 — 1.9 — 0.4 — 0.4Commodity contracts— 0.9 — 0.9 — 0.5 — 0.5Interest rate contracts— 1.9 — 1.9 — 1.8 — 1.8Total financial liabilities$— $7.3 $2,636.6 $2,643.9 $— $2.8 $2,059.4 $2,062.2

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