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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2014 Investment industry | Jun. 30, 2013 | 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 | $ 0.2 |  | $ 0.9 |
Document Period End Date |  | Jun. 30, 2014 |  |
Other than temporary impairment credit losses recognized in earnings additions other | 0.7 |  | 1.6 |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments | 0.5 |  | 0.8 |
Amortized cost on other-than temporary impairments |  |  |  | 4.1
Fair value on other than temporary impairments |  |  |  | 2.4
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 |  | 40.00% |  |
Total investments, Carrying Value |  | 18,751.1 |  | 16,465.9
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)
Other Marketable Securities, Current |  | 14,795.6 |  | 19.4
FGLH [Member] | Stockholders' Equity, Total [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value of investment |  | 439.1 |  | 1,983.7
Percentage of fair value of the invested assets portfolio |  | 2.30% |  | 12.00%
Investment in issuers |  | 2 |  | 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 |  | (1.7) | (1.0) |
Available for sale securities on fixed maturity |  | 4,352.5 | 5,741.6 |
Available-for-sale Securities, Gross Realized Gains |  | 74.6 | 284.0 |
Concentration [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Investment Securities Held by Subsidiaries Subject to Specialized Industry Accounting Principles at Fair Value |  | 2,175.4 |  | 1,892.1
Percentage of fair value of the invested assets portfolio |  | 11.60% |  | 11.50%
Number Of Issuers In Investment |  | 84 |  |
Concentration [Member] | FGLH [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value of investment |  | 250.0 |  | 150.7
Percentage of fair value of the invested assets portfolio |  | 1.30% |  | 0.90%
Insurance and Financial Services [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value on securities |  | 0.2 |  | 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 |  | 593.6 |  | 604.9
Fixed Maturities Available For Sale [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total investments, Carrying Value |  | 16,767.1 |  | 15,300.0
Fixed Maturities Available For Sale [Member] | Asset-backed securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total investments, Carrying Value |  | 1,737.7 |  | 1,523.1
Fixed Maturities Available For Sale [Member] | Non-agency residential mortgage-backed securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total investments, Carrying Value |  | $ 1,874.1 |  | $ 1,368.0

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