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Derivative Financial Instruments - FGL's Exposure to Credit Loss on Call Options Held (Detail) - USD ($) $ in Millions		9 Months Ended
		Jun. 30, 2015	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Document Period End Date		Jun. 30, 2015
Derivative, Notional Amount		$ 8,972.3
Bank of America [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	[1]	A/*/A
Derivative, Notional Amount		$ 2,438.4
Deutsche Bank [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	[1]	*/A1/A
Derivative, Notional Amount		$ 2,660.1
Morgan Stanley [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	[1]	A/A3/BBB+
Derivative, Notional Amount		$ 3,746.8
Barclay's Bank [Member]
Derivatives, Fair Value [Line Items]
Credit Rating (Moody's/S&P)	[1]	A/A2/A-
Derivative, Notional Amount		$ 127.0
Call options [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral		101.3	$ 108.3
Derivative, Notional Amount			296.3
Derivative Asset, Fair Value, Gross Asset		220.1	7,602.6
Derivative Asset, Collateral, Obligation to Return Cash, Offset		118.8	188.0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		248.6	324.1
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		220.1	296.3
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		43.8	40.2
Derivative, Notional Amount			92.7
Derivative Asset, Fair Value, Gross Asset		58.7	2,239.9
Derivative Asset, Collateral, Obligation to Return Cash, Offset		14.9	52.5
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		32.4	35.5
Derivative, Notional Amount			108.0
Derivative Asset, Fair Value, Gross Asset		71.8	2,810.0
Derivative Asset, Collateral, Obligation to Return Cash, Offset		39.4	72.5
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		23.8	22.0
Derivative, Notional Amount			85.0
Derivative Asset, Fair Value, Gross Asset		88.3	2,294.7
Derivative Asset, Collateral, Obligation to Return Cash, Offset		64.5	63.0
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		1.3	10.6
Derivative, Notional Amount			10.6
Derivative Asset, Fair Value, Gross Asset		1.3	258.0
Derivative Asset, Collateral, Obligation to Return Cash, Offset		$ 0.0	$ 0.0
[1] (a) An * represents credit ratings that were not available.

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

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