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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 1,222.9us-gaap_AssetsFairValueDisclosure 1,066.0us-gaap_AssetsFairValueDisclosure  
Other invested assets 341.8hrg_OtherInvestedAssets 165.0hrg_OtherInvestedAssets  
Liabilities      
Liabilities, Fair Value Disclosure 2,801.9us-gaap_LiabilitiesFairValueDisclosure 2,059.4us-gaap_LiabilitiesFairValueDisclosure  
Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring 19,455.1us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 18,501.7us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Contingent Purchase Price Reduction Receivable Fair Value Disclosure 47.0hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 41.5hrg_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 1,931.2us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 1,792.9us-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 729.3us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 636.9us-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 9,843.1us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 9,795.8us-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 543.3us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_ValuationTechniqueAxis
= hrg_BrokerQuotedMember		 848.0us-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 397.8us-gaap_AssetsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_ValuationTechniqueAxis
= hrg_MatrixPricingMember		 2.0us-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 1,357.3us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_HybridsMember		 1,316.1us-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 1,435.6us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hrg_MunicipalsMember		 1,259.8us-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 593.9us-gaap_MarketableSecuritiesEquitySecurities
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_AvailableForSaleEmbeddedDerivativesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 663.6us-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 12.2us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_NomuraFundLinkedNoteMember		   11.3us-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 2,217.4us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= hrg_FixedIndexAnnuityMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 1,908.1us-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
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Offered quotes 114.00%hrg_FairValueMeasurementsOfferedQuotes
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Weighted Average [Member] | Corporate Debt Securities [Member] | Broker Quoted [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Weighted Average [Member] | Corporate Debt Securities [Member] | Matrix Pricing [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Weighted Average [Member] | Equities [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Weighted Average [Member] | Nomura Fund Linked Note [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Weighted Average [Member] | Fixed Index Annuity [Member]      
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Front Street Future Policyholder Benefits Reserve [Member] | Maximum [Member]      
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Front Street Future Policyholder Benefits Reserve [Member] | Weighted Average [Member]      
Liabilities      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Level 3 [Member] | Municipal Bonds [Member] | Market Pricing [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Available-for-sale Securities   37.2us-gaap_AvailableForSaleSecurities
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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 47.0hrg_ContingentPurchasePriceReductionReceivableFairValueDisclosure
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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 6.0us-gaap_MarketableSecuritiesEquitySecurities
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Level 3 [Member] | Fixed Index Annuity [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Derivative Liability 2,217.4us-gaap_DerivativeLiabilities
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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 584.5us-gaap_DerivativeLiabilities
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Other Invested Assets [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Other invested assets 12.2hrg_OtherInvestedAssets
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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 0hrg_OtherInvestedAssets
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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   2.1hrg_OtherInvestedAssets
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Other Invested Assets [Member] | Level 3 [Member] | Other Invested Assets [Member] | Option Pricing [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Other invested assets   11.2hrg_OtherInvestedAssets
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Other Invested Assets [Member] | Level 3 [Member] | Nomura Fund Linked Note [Member] | Other Invested Assets [Member] | Option Pricing [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Other invested assets 12.2hrg_OtherInvestedAssets
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