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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Document Period End Date | Sep. 30, 2014 |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Other | $ 0.7 | $ 2.9 |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments | 0.6 | 0.8 | 5.7 |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Change Of Intent Operations | 0.1 | 2.2 | 17.1 |
Amortized Cost Of Investments With Other Than Temporary Impairments | 1.8 | 9.6 |  | 162.3
Fair value on other than temporary impairments | 1.1 | 6.7 |  | 138.0
Change-of-intent, and non-credit losses in other comprehensive income |  | 1.5 |  |
Total other-than-temporary impairments | 0.7 |  | 22.8 |
Non-agency residential mortgage-backed securities |  |  |  |
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) |  |
Securities held on deposit with various state regulatory authorities, fair value | 15,009.3 |  | 19.4 |
Total other-than-temporary impairments | 0.1 | 1.2 | 7.5 |
Net Investment Income |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available For Sale Securities On Fixed Maturity Under Commitment Agreement | 5,033.4 | 8,986.9 | 4,603.0 |
Available-for-sale Securities, Gross Realized Gains | 108.5 | 351.2 | 295.9 |
Available-for-sale Securities, Gross Realized Losses | (4.9) | 18.3 | 13.8 |
Insurance and Financial Services |  |  |  |
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% |  |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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