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Derivative Financial Instruments - FGL's Exposure to Credit Loss on Call Options Held (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2015		Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 8,685.0invest_DerivativeNotionalAmount
Bank of America [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	A/*/A	[1]
Derivative, Notional Amount	2,206.3invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hrg_BankOfAmericaMember
Deutsche Bank [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	*/A3/A	[1]
Derivative, Notional Amount	3,083.6invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hrg_DeutscheBankMember
Morgan Stanley [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	A+/A3/A	[1]
Derivative, Notional Amount	3,269.7invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hrg_MorganStanleyMember
Barclay's Bank [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	A/A2/A	[1]
Derivative, Notional Amount	125.4invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hrg_BarclaysBankMember
Call options [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	91.2us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember		108.3us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember
Derivative, Notional Amount			296.3invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember
Derivative Asset, Fair Value, Gross Asset	268.3us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember		7,602.6us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember
Derivative Asset, Collateral, Obligation to Return Cash, Offset	177.1us-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	320.8us-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	268.3us-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	35.5us-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, Notional Amount			92.7invest_DerivativeNotionalAmount / 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	70.0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = hrg_DerivativesForTradingAndInvestmentMember / us-gaap_CounterpartyNameAxis = hrg_BankOfAmericaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		2,239.9us-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	34.5us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset / us-gaap_BalanceSheetLocationAxis = hrg_DerivativesForTradingAndInvestmentMember / us-gaap_CounterpartyNameAxis = hrg_BankOfAmericaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		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	23.6us-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, Notional Amount			108.0invest_DerivativeNotionalAmount / 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	101.0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = hrg_DerivativesForTradingAndInvestmentMember / us-gaap_CounterpartyNameAxis = hrg_DeutscheBankMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		2,810.0us-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	77.4us-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	30.4us-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, Notional Amount			85.0invest_DerivativeNotionalAmount / 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	95.6us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = hrg_DerivativesForTradingAndInvestmentMember / us-gaap_CounterpartyNameAxis = hrg_MorganStanleyMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		2,294.7us-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	65.2us-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	1.7us-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, Notional Amount			10.6invest_DerivativeNotionalAmount / 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	1.7us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = hrg_DerivativesForTradingAndInvestmentMember / us-gaap_CounterpartyNameAxis = hrg_BarclaysBankMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CallOptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		258.0us-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
[1] (a) An * represents credit ratings that were not available.

X

- Definition

Derivative instrument credit rating.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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X

- Definition

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (b)

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4D

-Subparagraph (c)(2)

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- Definition

Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (e)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 55

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-Publisher FASB

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-Section 50

-Paragraph 8

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-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959

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