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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2013 Investment industry | Dec. 31, 2012 | Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Change Of Intent Operations |  | $ 0 |
Document Period End Date | Dec. 31, 2013 |  |
Available For Sale Securities Gross Unrealized Losses Investment | 280.1 |  | 263.9
Other than temporary impairment credit losses recognized in earnings additions other |  | 0.5 |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments |  | 0 |
Amortized cost on other-than temporary impairments | 0.2 |  | 1.6
Fair value on other than temporary impairments | 0.2 |  | 1.1
Change-of-intent, and non-credit losses in other comprehensive income |  | 1.5 |
Significant investment, number of industries | 1 |  |
Industry holdings, number of top investments | 10 |  |
Equity Securities Holdings Exposure Amount of Single Issuer Greater than Stated Percentage of Total Investments | 37.80% |  |
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 |  |
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)
Available For Sale Securities Gross Unrealized Losses Investment | 11.3 |  | 13.4
Other Marketable Securities, Current | 13,727.8 |  | 19.4
FGL [Member] | Stockholders' Equity, Total [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value of investment | 2,925.5 |  | 1,983.7
Percentage of fair value of the invested assets portfolio | 16.90% |  | 12.00%
Investment in issuers | 34 |  | 19
Percentage of stockholders equity | 10.00% |  |
Net Investment Income [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Gross Realized Losses | 0 | 0 |
Available for sale securities on fixed maturity | 1,705.9 | 0 |
Available-for-sale Securities, Gross Realized Gains | 0 | 0 |
Concentration [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value | 1,974.0 |  | 1,892.1
Percentage of fair value of the invested assets portfolio | 11.50% |  | 11.70%
Number Of Issuers In Investment | 82 |  |
Concentration [Member] | FGL [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value of investment | 140.5 |  | 150.7
Percentage of fair value of the invested assets portfolio | 1.00% |  |
Insurance and Financial Services [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair value on securities | 77.1 |  | 60.9
Percentage of amortized cost | 20.00% |  |
Percentage of carrying values of all investments (less than 1%) | 1.00% |  |
FHLB of Atlanta Funding Agreement Collateral Held [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Investment Owned, at Fair Value | $ 591.8 |  | $ 604.9

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