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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Jun. 30, 2015 |
Total fixed maturity available-for-sale securities, Amortized Cost | $ 17,388.5 |
Total fixed maturity available-for-sale securities, Fair Value | 17,723.6 |
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 814.2 |
Other securities which provide for periodic payments, Fair Value | 821.6 |
Structured hybrids [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 673.3 |
Other securities which provide for periodic payments, Fair Value | 661.1 |
Agency residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 2,099.5 |
Other securities which provide for periodic payments, Fair Value | 2,175.4 |
Other Invested Assets [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost |  | $ 164.9
Other Investments Gross Unrealized Gain |  | 0.1
Trading Securities |  | $ 165.0
Non-structured Hybrids [Member] | Corporate [Member] | Municipal [Member] | U.S. Government securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | 203.2 |
Due after one year through five years, Amortized Cost | 2,113.2 |
Due after five years through ten years, Amortized Cost | 2,955.1 |
Due after ten years, Amortized Cost | 6,623.3 |
Subtotal, Amortized Cost | 11,894.8 |
Due in one year or less, Fair Value | 205.7 |
Due after one year through five years, Fair Value | 2,153.2 |
Due after five years through ten years, Fair Value | 3,015.0 |
Due after ten years, Fair Value | 6,804.1 |
Subtotal, Fair Value | 12,178.0 |
Other Investments Asset [Member] | Other Invested Assets [Member] | All Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Cost | 442.4 |
Other Investments Gross Unrealized Gain | 0.0 |
Other Short Term Investments Gross Unrealized Losses | 0.0 |
Trading Securities | $ 442.4 |

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