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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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