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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 16, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Document Period End Date | Dec. 31, 2014 |  |  |  |
Assets, Fair Value Disclosure | $ 1,160.8 us-gaap_AssetsFairValueDisclosure |  | 1,066.0 us-gaap_AssetsFairValueDisclosure |  |
Other invested assets | 247.0 hrg_OtherInvestedAssets |  | 165.0 hrg_OtherInvestedAssets |  |
Liabilities |  |  |  |  |
Liabilities, Fair Value Disclosure | 2,636.6 us-gaap_LiabilitiesFairValueDisclosure |  | 2,059.4 us-gaap_LiabilitiesFairValueDisclosure |  |
Municipal [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Broker-quoted |  |  |  |
Commercial Mortgage Backed Securities [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Broker-quoted |  |  |  |
Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure | 905.5 us-gaap_AssetsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember |  | 848.0 us-gaap_AssetsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember |  |
Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Matrix Pricing |  |  |  |
Assets, Fair Value Disclosure | 2.1 us-gaap_AssetsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |  | 2.0 us-gaap_AssetsFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |  |
Municipal Bonds [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Broker-quoted |  |  |  |
Equities [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Broker-quoted |  |  |  |
Other Invested Assets [Member] | Black Scholes Model [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Black Scholes model |  |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring | 19,307.1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 18,501.7 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 1,839.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [1] | 1,792.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [1] |
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 668.4 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [1] | 636.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [1] |
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 9,721.4 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [1] | 9,795.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [1] |
Fair Value, Measurements, Recurring [Member] | Hybrids [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 1,301.5 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [1] | 1,316.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [1] |
Fair Value, Measurements, Recurring [Member] | Municipals [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 1,361.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [1] | 1,259.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [1] |
Contingent Purchase Price Reduction Receivable [Member] | Discounted cash flow [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Discounted cash flow |  |  |  |
Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Equity securities - available-for-sale | 625.9 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 663.6 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Nomura Fund Linked Note [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Liability |  |  |  |  | 11.3 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = hrg_NomuraFundLinkedNoteMember
Other invested assets | 11.8 hrg_OtherInvestedAssets / us-gaap_DerivativeInstrumentRiskAxis = hrg_NomuraFundLinkedNoteMember |  |  |  |
Fixed Index Annuity [Member] | Discounted cash flow [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Valuation Technique | Discounted cash flow |  |  |  |
Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Derivative Liability | 2,140.2 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 1,908.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Minimum [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 105.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Quoted prices | 65.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 62.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Offered quotes |  |  | 0.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Hybrids [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Quoted prices |  |  |  |  |
Minimum [Member] | Contingent Purchase Price Reduction Receivable [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Probability of collection | 88.00%hrg_FairValueMeasurementsProbabilityOfCollection / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 88.00%hrg_FairValueMeasurementsProbabilityOfCollection / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Fixed Index Annuity [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Market value of option | 0.00%hrg_FairValueInputsMarketValueOfOption / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 0.00%hrg_FairValueInputsMarketValueOfOption / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
SWAP rates |  |  | 2.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Surrender rates | 0.50%hrg_FairValueMeasurementsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 0.50%hrg_FairValueMeasurementsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 109.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 109.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 122.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 121.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Quoted prices |  |  | 120.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Offered quotes | 122.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 0.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Hybrids [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Quoted prices |  |  |  |  |
Maximum [Member] | Contingent Purchase Price Reduction Receivable [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Probability of collection | 96.00%hrg_FairValueMeasurementsProbabilityOfCollection / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 96.00%hrg_FairValueMeasurementsProbabilityOfCollection / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Expected term | 1 month 8 days |  | 4 months 5 days |  |
Discount rate | 1.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 1.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Credit insurance risk premium | 12.00%hrg_FairValueMeasurementsCreditInsuranceRiskPremium / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 12.00%hrg_FairValueMeasurementsCreditInsuranceRiskPremium / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Fixed Index Annuity [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Market value of option | 43.00%hrg_FairValueInputsMarketValueOfOption / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 50.00%hrg_FairValueInputsMarketValueOfOption / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
SWAP rates |  |  | 2.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Surrender rates | 75.00%hrg_FairValueMeasurementsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 75.00%hrg_FairValueMeasurementsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Weighted Average [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 101.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 115.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 118.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Quoted prices | 102.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 100.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Offered quotes | 148.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 142.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Municipal Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 112.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |  |
Weighted Average [Member] | Hybrids [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Quoted prices |  |  | 107.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Equities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_EquitiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_EquitiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Nomura Fund Linked Note [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Offered quotes | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NomuraFundLinkedNoteMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_NomuraFundLinkedNoteMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Contingent Purchase Price Reduction Receivable [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Probability of collection | 92.00%hrg_FairValueMeasurementsProbabilityOfCollection / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 92.00%hrg_FairValueMeasurementsProbabilityOfCollection / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Fixed Index Annuity [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Market value of option | 3.00%hrg_FairValueInputsMarketValueOfOption / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 3.00%hrg_FairValueInputsMarketValueOfOption / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
SWAP rates | 2.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 3.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Mortality multiplier | 80.00%hrg_FairValueMeasurementsMortalityMultiplier / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 80.00%hrg_FairValueMeasurementsMortalityMultiplier / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Surrender rates | 7.00%hrg_FairValueMeasurementsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 7.00%hrg_FairValueMeasurementsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Fair Value Measurements Non Performance Spread | 0.25%hrg_FairValueMeasurementsNonPerformanceSpread / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 0.25%hrg_FairValueMeasurementsNonPerformanceSpread / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Front Street Future Policyholder Benefits Reserve [Member] | Minimum [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Fair Value Measurements Non Performance Spread | 0.50%hrg_FairValueMeasurementsNonPerformanceSpread / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 0.50%hrg_FairValueMeasurementsNonPerformanceSpread / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Front Street Future Policyholder Benefits Reserve [Member] | Maximum [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Fair Value Measurements Non Performance Spread | 1.50%hrg_FairValueMeasurementsNonPerformanceSpread / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 1.50%hrg_FairValueMeasurementsNonPerformanceSpread / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Front Street Future Policyholder Benefits Reserve [Member] | Weighted Average [Member] |  |  |  |  |
Liabilities |  |  |  |  |
Risk margin for uncertainty | 0.50%hrg_Riskmarginforuncertainty / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  | 0.50%hrg_Riskmarginforuncertainty / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring | 550.2 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 279.3 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 1 [Member] | Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 59.2 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring | 17,596.1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 17,156.4 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 1,755.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | [1] |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 553.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [1] |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 8,945.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [1] |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Hybrids [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 1,316.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [1] |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipals [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 1,222.6 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | [1] |
Level 2 [Member] | Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 598.4 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring | 1,160.8 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 1,066.0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 34.6 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember | [1] | 37.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember | [1] |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Broker Quoted [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 120.4 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember | [1] | 83.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember | [1] |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 850.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [1] |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Hybrids [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | [1] |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member] | Market Pricing [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Available-for-sale Securities | 38.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember / us-gaap_ValuationTechniqueAxis = hrg_MarketPricingMember | [1] |  |  |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipals [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] |
Level 3 [Member] | Contingent Purchase Price Reduction Receivable [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 3 [Member] | Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] |
Level 3 [Member] | Available For Sale Embedded Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Market Pricing [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Equity securities - available-for-sale | 6.1 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_MarketPricingMember | [1] |  |  |
Level 3 [Member] | Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 | [1] | 1,908.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Level 3 [Member] | Front Street Future Policyholder Benefits Reserve [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Derivative Liability | 496.4 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] | 151.3 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | [1] |
Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 |  |
Other Invested Assets [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 |  |
Other Invested Assets [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Other invested assets | 2.0 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember | [1] | 2.1 hrg_OtherInvestedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_InvestmentTypeAxis = hrg_OtherInvestedAssetsMember | [1] |
Other Invested Assets [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member] | Option Pricing [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
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 |  |
Other Invested Assets [Member] | Level 3 [Member] | Nomura Fund Linked Note [Member] | Fair Value, Measurements, Recurring [Member] | Other Invested Assets [Member] | Option Pricing [Member] |  |  |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Other invested assets | $ 11.8 hrg_OtherInvestedAssets / us-gaap_DerivativeInstrumentRiskAxis = hrg_NomuraFundLinkedNoteMember / 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] | 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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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Contingent purchase price reduction receivable. + References No definition available. + Details
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- Definition Fair value inputs market value of option. + References No definition available. + Details
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- Definition Fair value measurements probability of collection. + References No definition available. + Details
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- Definition Fair value measurements quoted prices. + References No definition available. + Details
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- Definition Surrender rates. + References No definition available. + Details
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- Definition Fair value measurements swap rates. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph b -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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