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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, 2013 | Sep. 30, 2012
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 6,183.2 | $ 5,830.4
Fair Value | 262.6 | 200.7
Bank of America [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | Baa2/A- |
Notional Amount | 1,936.9 | 1,884.0
Deutsche Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | A2/A+ |
Notional Amount | 1,723.0 | 1,816.5
Morgan Stanley [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | Baa1/A- |
Notional Amount | 1,938.6 | 1,634.7
Royal Bank of Scotland [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | Baa1/A- |
Notional Amount | 468.0 | 353.9
Barclay's Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | A2/A+ |
Notional Amount | 116.7 | 131.3
Credit Suisse [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Rating (Moody's/S&P) | A2/A |
Notional Amount | 0 | 10.0
Call options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 262.0 | 200.7
Derivatives Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 266.0 | 203.9
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 262.0 | 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 | 81.0 | 64.1
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Deutsche Bank [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 69.6 | 61.7
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Morgan Stanley [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 80.3 | 51.6
Derivatives [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Call options [Member] | Royal Bank of Scotland [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | 27.7 | 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 | 3.4 | 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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- Definition Derivative instrument credit rating. + References No definition available. + Details
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- 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 + Details
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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=7476318&loc=SL5624163-113959 + Details
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