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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 Investment industry | Apr. 01, 2012 | Mar. 31, 2013 Investment industry | Apr. 01, 2012 | Sep. 30, 2012 | Jan. 01, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residiential-mortgage-backed securities | $ 19.9 |  | $ 19.9 |  | $ 30.6 |
Other than temporary impairment credit losses recognized in earnings additions other | 0.4 | 4.1 | 0.9 | 17.3 |  |
Credit losses in operations, including credit impairments | 0.1 |  | 0.3 |  |  |
Credit losses in operations, change of intent operations | 0.3 | 1.6 | 0.7 | 14.7 |  |
Amortized cost on other-than temporary impairments | 2.7 |  | 2.7 |  |  | 86.9
Fair value on other than temporary impairments | 1.8 |  | 1.8 |  |  | 68.0
Change-of-intent, and non-credit losses in other comprehensive income |  | 2.6 |  | 2.6 |  |
Other than temporary impairment losses, available-for-sale securities | 0.4 | 4.1 | 0.9 | 17.3 |  |
Significant investment, number of industries | 1 |  | 1 |  |  |
Industry holdings, number of top investments | 10 |  | 10 |  |  |
Non-agency residential mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities | 0.9 |  | 0.9 |  | 0.9 |
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities | 1.9 |  | 1.9 |  | 1.9 |
Fair value of securities held on deposit | 20.4 |  | 20.4 |  | 20.7 |
FGL [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value of investment | 2,036.4 |  | 2,036.4 |  |  |
Percentage of fair value of the invested assets portfolio | 12.20% |  | 12.20% |  |  |
Investment in issuers | 87 |  | 87 |  |  |
Percentage of investment accounting | 39.60% |  | 39.60% |  |  |
FGL's exposure to sub-prime | 332.3 |  | 332.3 |  |  |
FGL's exposure to Alternative-A residential mortgage-backed securities | 328.6 |  | 328.6 |  |  |
Percentage of FGL's exposure to sub-prime to invested assets | 2.00% |  | 2.00% |  |  |
FGL [Member] | Stockholders' Equity, Total [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value of investment | 1,408.0 |  | 1,408.0 |  | 1,625.9 |
Percentage of fair value of the invested assets portfolio | 8.40% |  | 8.40% |  | 9.80% |
Investment in issuers | 10 |  | 10 |  | 13 |
Percentage of stockholders equity | 10.00% |  | 10.00% |  |  |
Net Investment Income [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available for sale securities on fixed maturity | 2,490.4 | 1,417.0 | 4,905.5 | 3,150.1 |  |
Gross gains on available-for-sale securities | 71.0 | 70.1 | 249.0 | 162.4 |  |
Gross losses on available-for-sale securities | 0.1 | 1.2 | 0.6 | 11.7 |  |
Concentration [Member] | FGL [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value of investment | 167.7 |  | 167.7 |  | 152.9 |
Percentage of fair value of the invested assets portfolio | 1.00% |  | 1.00% |  | 0.70% |
Insurance and Financial Services [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value on securities | $ 0.1 |  | $ 0.1 |  | $ 1.2 |
Percentage of amortized cost |  |  | 20.00% |  |  |
Percentage of carrying values of all investments (less than 1%) |  |  | 1.00% |  |  |

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