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Investments - Net Investment Gains (Losses) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Gain (Loss) on Investments [Line Items]        
Net realized gains on fixed maturity available-for-sale securities $ 54.6 $ 74.4 $ 60.5 $ 92.1
Realized gains on equity securities (1.5) 3.0 (4.7) 13.8
Net realized gains on securities 53.1 77.4 55.8 105.9
Realized gains (losses) on certain derivative instruments 41.0 62.7 129.2 173.3
Unrealized gains on certain derivative instruments (48.6) 38.9 (99.3) 78.2
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net (0.5) 0.3 0.5 0.3
Change in fair value of derivatives (8.1) 101.9 30.4 251.8
Realized gains on other invested assets (39.3) 5.3 (32.4) 9.7
Net investment gains (losses) $ 5.7 $ 184.6 $ 53.8 $ 367.4