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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2013 Investment industry | Jun. 30, 2013 Investment industry | Jul. 01, 2012 | Jul. 01, 2013 | Sep. 30, 2012 | Jan. 01, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Document Period End Date |  | Jun. 30, 2013 |  |  |  |
Treasury Yield | 2.48% | 2.48% |  |  | 1.63% |
Other than temporary impairment credit losses recognized in earnings additions other | $ 0.7 | $ 1.6 | $ 19.8 | $ 2.5 |  |
Credit losses in operations, including credit impairments | 0.5 | 0.8 |  |  |  |
Credit losses in operations, change of intent operations | 0.2 | 0.9 | 15.0 | 1.8 |  |
Amortized cost on other-than temporary impairments | 4.1 | 4.1 |  |  |  | 101.9
Fair value on other than temporary impairments | 2.4 | 2.4 |  |  |  | 80.6
Change-of-intent, and non-credit losses in other comprehensive income |  | 0 | 2.6 | 0.7 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | 0.7 | 1.6 | 19.8 | 2.5 |  |
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 | 0 |  |  | 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 | 0 | 0 |  |  | 1.9 |
Other Marketable Securities, Current | 0 | 0 |  |  | 0 |
FGL [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value of investment | 1,944.6 | 1,944.6 |  |  |  |
Percentage of fair value of the invested assets portfolio | 11.80% | 11.80% |  |  |  |
Investment in issuers | 78 | 78 |  |  |  |
Percentage of investment accounting | 34.90% | 34.90% |  |  |  |
FGL [Member] | Stockholders' Equity, Total [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value of investment | 1,629.2 | 1,629.2 |  |  | 1,625.9 |
Percentage of fair value of the invested assets portfolio | 10.00% | 10.00% |  |  | 9.80% |
Investment in issuers |  |  |  |  | 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 | 836.0 | 5,741.6 | 4,366.3 | 1,216.2 |  |
Available-for-sale Securities, Gross Realized Gains | 35.0 | 284.0 | 211.9 | 49.5 |  |
Available-for-sale Securities, Gross Realized Losses | (0.5) | 1.0 | 20.9 | 9.2 |  |
Concentration [Member] | FGL [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Fair value of investment | 156.9 | 156.9 |  |  | 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 | $ 25.4 | $ 25.4 |  |  | $ 1.2 |
Percentage of amortized cost |  | 20.00% |  |  |  |
Percentage of carrying values of all investments (less than 1%) |  | 1.00% |  |  |  |

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