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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jun. 30, 2014
Security
Sep. 30, 2013
Security
Schedule of Available-for-sale Securities [Line Items]    
Document Period End Date Jun. 30, 2014  
Available-for-sale securities, Fair Value, Less than 12 months $ 1,197.5 $ 5,405.9
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses (16.2) (235.9)
Available-for-sale securities, Fair Value, 12 months or longer 1,844.6 520.0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (52.4) (28.0)
Available-for-sale securities, Fair Value, Total 3,042.1 5,925.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 68.6 263.9
Total number of available-for-sale securities in an unrealized loss position, Less than 12 months 175 588
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer 250 78
Total number of available-for-sale securities in an unrealized loss position 425 666
Asset-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 454.0 329.3
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses (3.8) (4.5)
Available-for-sale securities, Fair Value, 12 months or longer 306.2 81.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (5.7) (0.7)
Available-for-sale securities, Fair Value, Total 760.2 410.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 9.5 5.2
Commercial mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 52.8 26.6
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses (0.1) (0.5)
Available-for-sale securities, Fair Value, 12 months or longer 0.2 4.9
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (1.0) (1.1)
Available-for-sale securities, Fair Value, Total 53.0 31.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1.1 1.6
Corporates [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 446.1 3,457.2
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses (8.0) (175.0)
Available-for-sale securities, Fair Value, 12 months or longer 1,009.2 186.0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (28.6) (10.1)
Available-for-sale securities, Fair Value, Total 1,455.3 3,643.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 36.6 185.1
Equities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 46.0 118.6
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses (0.2) (9.1)
Available-for-sale securities, Fair Value, 12 months or longer 80.6 32.2
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (4.7) (1.2)
Available-for-sale securities, Fair Value, Total 126.6 150.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 4.9 10.3
Hybrids [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months    52.0
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses    (3.3)
Available-for-sale securities, Fair Value, 12 months or longer 12.7   
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (0.2)   
Available-for-sale securities, Fair Value, Total 12.7 52.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 0.2 3.3
Municipals [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 15.9 333.3
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses    (27.3)
Available-for-sale securities, Fair Value, 12 months or longer 213.6 144.4
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (7.2) (13.5)
Available-for-sale securities, Fair Value, Total 229.5 477.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 7.2 40.8
Agency residential mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 5.5 9.8
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses    (0.1)
Available-for-sale securities, Fair Value, 12 months or longer 0.7 1.1
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer    (0.2)
Available-for-sale securities, Fair Value, Total 6.2 10.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss    0.3
Non-agency residential mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 177.2 325.2
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses (4.1) (12.2)
Available-for-sale securities, Fair Value, 12 months or longer 139.7 69.9
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (3.7) (1.2)
Available-for-sale securities, Fair Value, Total 316.9 395.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 7.8 13.4
U.S. Government securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months     
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses     
Available-for-sale securities, Fair Value, 12 months or longer 81.7  
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer (1.3)  
Available-for-sale securities, Fair Value, Total 81.7  
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1.3  
US Government Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   753.9
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses   (3.9)
Available-for-sale securities, Fair Value, 12 months or longer     
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer     
Available-for-sale securities, Fair Value, Total   753.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ 3.9