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Investments - Net Investment Gains (Losses) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Gain (Loss) on Investments [Abstract]    
Document Period End Date Dec. 31, 2013  
Net realized gains before other-than-temporary impairments $ 9.8 $ 172.5
Gross other-than-temporary impairments    (0.5)
Net realized gains on fixed maturity available-for-sale securities 9.8 172.0
Realized gains on equity securities 5.4 0
Net realized gains on securities 15.2 172.0
Realized gains (losses) on certain derivative instruments 66.8 15.6
Unrealized gains on certain derivative instruments 60.6 (41.2)
Change in fair value of derivatives 127.4 (25.6)
Realized gains on other invested assets (0.7) 0.1
Net investment gains (losses) $ 141.9 $ 146.5