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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 | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Sep. 30, 2014 | Jun. 16, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure | 1,222.9 us-gaap_AssetsFairValueDisclosure | 1,066.0 us-gaap_AssetsFairValueDisclosure |
Other invested assets | 341.8 hrg_OtherInvestedAssets | 165.0 hrg_OtherInvestedAssets |
Liabilities |  |  |
Liabilities, Fair Value Disclosure | 2,801.9 us-gaap_LiabilitiesFairValueDisclosure | 2,059.4 us-gaap_LiabilitiesFairValueDisclosure |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 19,455.1 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 18,501.7 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Contingent Purchase Price Reduction Receivable Fair Value Disclosure | 47.0 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,931.2 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 1,792.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Matrix pricing |  |
Municipal [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 729.3 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 636.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Commercial Mortgage Backed Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Commercial Mortgage Backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Matrix pricing |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 9,843.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 9,795.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure | 543.3 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 | 397.8 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 |
Hybrids [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,357.3 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | 1,316.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember |
Municipal Bonds [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Broker-quoted |  |
Municipals [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,435.6 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | 1,259.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |
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 |  |
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 | 593.9 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 663.6 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Nomura Fund Linked Note [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Liability | 12.2 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = hrg_NomuraFundLinkedNoteMember |  | 11.3 us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = hrg_NomuraFundLinkedNoteMember
Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Derivative Liability | 2,217.4 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 1,908.1 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Front Street Future Policyholder Benefits Reserve [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Valuation Technique | Discounted cash flow |  |
Minimum [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 0.00%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] | Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |
Minimum [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 106.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
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 | 67.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Offered quotes | 75.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes |  | 62.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember |
Minimum [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |
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 | 0.00%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 |  |  |
Surrender rates | 0.50%hrg_FairValueInputsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |  |
Liabilities |  |  |
SWAP rates |  | 2.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = hrg_DiscountedCashFlowMember |
Surrender rates |  | 0.50%hrg_FairValueInputsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = hrg_DiscountedCashFlowMember |
Maximum [Member] | Asset-backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 0.00%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] | Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |
Maximum [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 123.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Offered quotes | 121.00%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 | 150.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Offered quotes | 123.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes |  | 120.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember |
Maximum [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |
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 | 0.00%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 | 0 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 | 7.00%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] | Contingent Purchase Price Reduction Receivable [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Expected term |  | 4 months 5 days |
Maximum [Member] | Fixed Index Annuity [Member] |  |  |
Liabilities |  |  |
Market value of option | 42.00%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 |  |  |
Surrender rates | 75.00%hrg_FairValueInputsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |  |
Liabilities |  |  |
SWAP rates |  | 3.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = hrg_DiscountedCashFlowMember |
Surrender rates |  | 75.00%hrg_FairValueInputsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = hrg_DiscountedCashFlowMember |
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] | Asset-backed Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 110.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |
Weighted Average [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices | 115.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 0.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
Offered quotes | 114.00%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 | 103.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Offered quotes | 103.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Weighted Average [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes |  | 100.00%hrg_FairValueMeasurementsOfferedQuotes / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember |
Weighted Average [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Quoted prices |  | 142.00%hrg_FairValueMeasurementsQuotedPrices / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = hrg_MatrixPricingMember |
Weighted Average [Member] | Municipal Debt Securities [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Offered quotes | 115.00%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 | 94.00%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 |  |
Mortality multiplier | 80.00%hrg_FairValueInputsMortalityMultiplier / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 80.00%hrg_FairValueInputsMortalityMultiplier / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
Surrender rates | 7.00%hrg_FairValueInputsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Fair Value Measurements Non Performance Spread | 0.25%hrg_FairValueInputsNonPerformanceSpread / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember | 0.25%hrg_FairValueInputsNonPerformanceSpread / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |
Weighted Average [Member] | Fixed Index Annuity [Member] | Discounted Cash Flow [Member] |  |  |
Liabilities |  |  |
SWAP rates |  | 2.00%hrg_FairValueMeasurementsSwapRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = hrg_DiscountedCashFlowMember |
Surrender rates |  | 7.00%hrg_FairValueInputsSurrenderRates / us-gaap_DerivativeInstrumentRiskAxis = hrg_FixedIndexAnnuityMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = hrg_DiscountedCashFlowMember |
Front Street Future Policyholder Benefits Reserve [Member] | Minimum [Member] |  |  |
Liabilities |  |  |
Fair Value Measurements Non Performance Spread | 0.50%hrg_FairValueInputsNonPerformanceSpread / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.50%hrg_FairValueInputsNonPerformanceSpread / 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_FairValueInputsNonPerformanceSpread / us-gaap_FairValueByLiabilityClassAxis = hrg_FrontStreetFuturePolicyholderBenefitsReserveMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.50%hrg_FairValueInputsNonPerformanceSpread / 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 | 1.00%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 | 240.0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 279.3 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
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 | 27.2 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 59.2 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 17,992.2 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 17,156.4 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 2 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,896.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 1,755.9 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |
Level 2 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 586.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 553.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |
Level 2 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 8,902.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 8,945.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
Level 2 [Member] | Hybrids [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,357.3 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember | 1,316.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember |
Level 2 [Member] | Municipals [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 1,395.8 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember | 1,222.6 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_MunicipalsMember |
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 | 560.7 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 598.4 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_DerivativeInstrumentRiskAxis = hrg_AvailableForSaleEmbeddedDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure, Recurring | 1,222.9 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 1,066.0 us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 3 [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 34.3 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember |  |
Level 3 [Member] | Asset-backed Securities [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 31.0 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 | 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 |
Level 3 [Member] | Asset-backed Securities [Member] | Matrix Pricing [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 3.3 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_MatrixPricingMember | 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_MatrixPricingMember |
Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 142.5 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember |  |
Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Broker Quoted [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 97.5 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 | 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 |
Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Matrix Pricing [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 45.0 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_MatrixPricingMember | 0 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_MatrixPricingMember |
Level 3 [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 941.1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 850.0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
Level 3 [Member] | Hybrids [Member] | Fair Value, Measurements, Recurring [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 | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hrg_HybridsMember |
Level 3 [Member] | Municipal Bonds [Member] | Market Pricing [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Available-for-sale Securities | 39.8 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 |  |
Level 3 [Member] | Municipals [Member] | Fair Value, Measurements, Recurring [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 |
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 | 47.0 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 41.5 hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hrg_ContingentPurchasePriceReductionReceivableMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |
Level 3 [Member] | Available For Sale Embedded Derivatives [Member] | Equity Securities [Member] | Broker Quoted [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 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_ValuationTechniqueAxis = hrg_BrokerQuotedMember | 6.0 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_BrokerQuotedMember |
Level 3 [Member] | Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
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