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Investments - Amortized Cost and Fair Value of Fixed Maturity 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, Accumulated Loss $ 498.3 $ 108.8
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, 12 Months or Longer, Accumulated Loss 256.1 69.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,404.4 4,862.6
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
Total fixed maturity available-for-sale securities, Amortized Cost 17,391.5  
Total fixed maturity available-for-sale securities, Fair Value $ 17,514.8  
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
U.S. Government    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ 1.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   37.3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   1.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   119.0
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
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 47.1 18.8
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, 12 Months or Longer, Accumulated Loss 33.3 7.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,436.9 1,114.0
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
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 9.4 2.0
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, 12 Months or Longer, Accumulated Loss 2.1 1.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 394.6 160.7
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
Other securities which provide for periodic payments, Amortized Cost 877.9  
Other securities which provide for periodic payments, Fair Value 882.2  
Structured hybrids    
Schedule of Available-for-sale Securities [Line Items]    
Other securities which provide for periodic payments, Amortized Cost 698.1  
Other securities which provide for periodic payments, Fair Value 679.3  
Agency Residential Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 26.3 11.1
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, 12 Months or Longer, Accumulated Loss 16.0 5.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 717.0 476.1
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
Other securities which provide for periodic payments, Amortized Cost 2,099.4  
Other securities which provide for periodic payments, Fair Value 2,162.5  
Corporates    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 354.1 48.9
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, 12 Months or Longer, Accumulated Loss 153.5 32.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,670.6 1,944.4
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
Equities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 4.0 5.1
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, 12 Months or Longer, Accumulated Loss 3.7 2.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 142.7 235.3
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
Hybrids    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 42.3 15.2
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, 12 Months or Longer, Accumulated Loss 38.5 12.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 629.7 548.2
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
Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 15.1 6.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 220.5  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9.0 6.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 412.9 264.9
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
Non-structured Hybrids | Corporate | Municipal | U.S. Government    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost 155.9  
Due after one year through five years, Amortized Cost 1,800.7  
Due after five years through ten years, Amortized Cost 2,947.6  
Due after ten years, Amortized Cost 6,909.3  
Subtotal, Amortized Cost 11,813.5  
Due in one year or less, Fair Value 158.1  
Due after one year through five years, Fair Value 1,818.2  
Due after five years through ten years, Fair Value 2,947.3  
Due after ten years, Fair Value 7,006.7  
Subtotal, Fair Value 11,930.3  
Fixed-maturity securities, available-for-sale    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 17,391.5 16,468.7
Fixed-maturity securities, available-for-sale | U.S. Government    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 233.4 291.0
Fixed-maturity securities, available-for-sale | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 1,902.6 1,800.8
Fixed-maturity securities, available-for-sale | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 877.9 617.6
Fixed-maturity securities, available-for-sale | Agency Residential Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 2,099.4 1,984.8
Fixed-maturity securities, available-for-sale | Corporates    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 9,547.7 9,345.5
Fixed-maturity securities, available-for-sale | Hybrids    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost 1,210.8 1,279.1
Fixed-maturity securities, available-for-sale | Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Total fixed maturity available-for-sale securities, Amortized Cost $ 1,519.7 $ 1,149.9