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Derivative Financial Instruments - FGL's Exposure to Credit Loss on Call Options Held (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Derivatives, Fair Value [Line Items]    
Document Period End Date Dec. 31, 2014  
Derivative, Notional Amount $ 8,151.5invest_DerivativeNotionalAmount $ 7,602.6invest_DerivativeNotionalAmount
Bank of America [Member]    
Derivatives, Fair Value [Line Items]    
Credit Rating (Moody's/S&P) A/*/A  
Derivative, Notional Amount 2,004.8invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember		 2,239.9invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
Deutsche Bank [Member]    
Derivatives, Fair Value [Line Items]    
Credit Rating (Moody's/S&P) */A3/A  
Derivative, Notional Amount 2,681.8invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember		 2,810.0invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
Morgan Stanley [Member]    
Derivatives, Fair Value [Line Items]    
Credit Rating (Moody's/S&P) A+/A3/A  
Derivative, Notional Amount 3,205.6invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember		 2,294.7invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
Barclay's Bank [Member]    
Derivatives, Fair Value [Line Items]    
Credit Rating (Moody's/S&P) A/A2/A  
Derivative, Notional Amount 259.3invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember		 258.0invest_DerivativeNotionalAmount
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
Call options [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 93.0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember		 108.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
Derivative Asset, Fair Value, Gross Asset 306.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember		 296.3us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
Derivative Asset, Collateral, Obligation to Return Cash, Offset 213.2us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember		 188.0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 355.8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 324.1us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivatives For Trading And Investment [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 306.2us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 296.3us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivatives For Trading And Investment [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member] | Bank of America [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 36.2us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 40.2us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Fair Value, Gross Asset 74.6us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 92.7us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Collateral, Obligation to Return Cash, Offset 38.4us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 52.5us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BankOfAmericaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivatives For Trading And Investment [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member] | Deutsche Bank [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 27.2us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 35.5us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Fair Value, Gross Asset 123.0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 108.0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Collateral, Obligation to Return Cash, Offset 95.8us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 72.5us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_DeutscheBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivatives For Trading And Investment [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member] | Morgan Stanley [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 17.9us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 22.0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Fair Value, Gross Asset 96.9us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 85.0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Collateral, Obligation to Return Cash, Offset 79.0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 63.0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_MorganStanleyMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivatives For Trading And Investment [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member] | Barclay's Bank [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 11.7us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 10.6us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Fair Value, Gross Asset 11.7us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 10.6us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative Asset, Collateral, Obligation to Return Cash, Offset $ 0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hrg_DerivativesForTradingAndInvestmentMember
/ us-gaap_CounterpartyNameAxis
= hrg_BarclaysBankMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember