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Derivative Financial Instruments - FGL's Exposure to Credit Loss on Call Options Held (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012
Derivatives, Fair Value [Line Items] |  |
Document Period End Date | Jun. 30, 2013 |
Derivative, Notional Amount | $ 6,293.2 | $ 5,830.4
Fair Value | 227.4 | 200.7
Bank of America [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | Baa2/A- |
Derivative, Notional Amount | 2,098.4 | 1,884.0
Deutsche Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | Baa1/A- |
Derivative, Notional Amount | 2,024.7 | 1,634.7
Morgan Stanley [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | A2/A+ |
Derivative, Notional Amount | 1,564.0 | 1,816.5
Royal Bank of Scotland [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | Baa1/A- |
Derivative, Notional Amount | 479.0 | 353.9
Barclay's Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | A2/A+ |
Derivative, Notional Amount | 127.1 | 131.3
Credit Suisse [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | A2/A |
Derivative, Notional Amount | 0 | 10.0
Call options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 227.4 | 200.7
Derivatives Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 237.6 | 203.9
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 227.4 | 200.7
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Bank of America [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 76.4 | 64.1
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Deutsche Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 64.5 | 51.6
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Morgan Stanley [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 57.4 | 61.7
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Royal Bank of Scotland [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 24.6 | 19.6
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Barclay's Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 4.5 | 3.1
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Credit Suisse [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 0 | $ 0.6

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