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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Security
Sep. 30, 2012
Security
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value $ 5,405.9 $ 681.1
Less than 12 months, Gross Unrealized Losses (235.9) (11.9)
12 months or longer, Fair Value 520.0 323.8
12 months or longer, Gross Unrealized Losses (28.0) (18.7)
Total, Fair Value 5,925.9 1,004.9
Total, Gross Unrealized Losses (263.9) (30.6)
Total number of available-for-sale securities in an unrealized loss position, Less than 12 months 588 100
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer 78 56
Total number of available-for-sale securities in an unrealized loss position 666 156
Asset-backed securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 329.3 169.8
Less than 12 months, Gross Unrealized Losses (4.5) (1.0)
12 months or longer, Fair Value 81.5 7.5
12 months or longer, Gross Unrealized Losses (0.7) (0.6)
Total, Fair Value 410.8 177.3
Total, Gross Unrealized Losses (5.2) (1.6)
Commercial mortgage-backed securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 26.6 0.8
Less than 12 months, Gross Unrealized Losses (0.5) (0.8)
12 months or longer, Fair Value 4.9 10.7
12 months or longer, Gross Unrealized Losses (1.1) (1.6)
Total, Fair Value 31.5 11.5
Total, Gross Unrealized Losses (1.6) (2.4)
Corporates
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 3,457.2 411.3
Less than 12 months, Gross Unrealized Losses (175.0) (8.1)
12 months or longer, Fair Value 186.0 45.5
12 months or longer, Gross Unrealized Losses (10.1) (1.9)
Total, Fair Value 3,643.2 456.8
Total, Gross Unrealized Losses (185.1) (10.0)
Equities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 118.6   
Less than 12 months, Gross Unrealized Losses (9.1)   
12 months or longer, Fair Value 32.2 44.5
12 months or longer, Gross Unrealized Losses (1.2) (1.3)
Total, Fair Value 150.8 44.5
Total, Gross Unrealized Losses (10.3) (1.3)
Hybrids
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 52.0 13.4
Less than 12 months, Gross Unrealized Losses (3.3) (0.4)
12 months or longer, Fair Value    107.7
12 months or longer, Gross Unrealized Losses    (9.2)
Total, Fair Value 52.0 121.1
Total, Gross Unrealized Losses (3.3) (9.6)
Municipals
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 333.3 71.1
Less than 12 months, Gross Unrealized Losses (27.3) (1.1)
12 months or longer, Fair Value 144.4   
12 months or longer, Gross Unrealized Losses (13.5)   
Total, Fair Value 477.7 71.1
Total, Gross Unrealized Losses (40.8) (1.1)
Agency Residential Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 9.8 1.8
Less than 12 months, Gross Unrealized Losses (0.1) (0.2)
12 months or longer, Fair Value 1.1 6.1
12 months or longer, Gross Unrealized Losses (0.2) (0.1)
Total, Fair Value 10.9 7.9
Total, Gross Unrealized Losses (0.3) (0.3)
Non-agency residential mortgage-backed securities
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 325.2 12.9
Less than 12 months, Gross Unrealized Losses (12.2) (0.3)
12 months or longer, Fair Value 69.9 101.8
12 months or longer, Gross Unrealized Losses (1.2) (4.0)
Total, Fair Value 395.1 114.7
Total, Gross Unrealized Losses (13.4) (4.3)
U.S. Government
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 753.9  
Less than 12 months, Gross Unrealized Losses (3.9)  
12 months or longer, Fair Value 0  
12 months or longer, Gross Unrealized Losses 0  
Total, Fair Value 753.9  
Total, Gross Unrealized Losses $ (3.9)