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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail)
$ in Millions
Sep. 30, 2015
USD ($)
Security
Sep. 30, 2014
USD ($)
Security
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,976.2 $ 2,577.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 242.2 39.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,428.2 2,285.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 256.1 69.4
Total, Fair Value 7,404.4 4,862.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 498.3 $ 108.8
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Security 707 319
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | Security 396 310
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | Security 1,103 629
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 603.8 $ 825.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 13.8 11.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 833.1 288.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 33.3 7.0
Total, Fair Value 1,436.9 1,114.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 47.1 18.8
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 262.1 160.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7.3 0.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 132.5 0.4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2.1 1.1
Total, Fair Value 394.6 160.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 9.4 2.0
Corporates    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 2,342.4 816.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 200.6 16.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,328.2 1,127.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 153.5 32.6
Total, Fair Value 3,670.6 1,944.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 354.1 48.9
Equities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 36.7 180.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.3 2.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 106.0 54.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3.7 2.9
Total, Fair Value 142.7 235.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 4.0 5.1
Hybrids    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 87.6 258.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3.8 2.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 542.1 290.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 38.5 12.9
Total, Fair Value 629.7 548.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 42.3 15.2
Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 220.5  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6.1  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 192.4 264.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9.0 6.3
Total, Fair Value 412.9 264.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 15.1 6.3
Agency Residential Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 423.1 298.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10.3 5.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 293.9 177.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16.0 5.3
Total, Fair Value 717.0 476.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 26.3 11.1
U.S. Government    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   37.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   81.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   1.3
Total, Fair Value   119.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ 1.4