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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]  
Total fixed maturity available-for-sale securities, Amortized Cost $ 15,062.1
Total fixed maturity available-for-sale securities, Fair Value 15,300.0
Asset-backed securities
  
Schedule of Available-for-sale Securities [Line Items]  
Other securities which provide for periodic payments, Amortized Cost 1,505.7
Other securities which provide for periodic payments, Fair Value 1,523.1
Commercial mortgage-backed securities
  
Schedule of Available-for-sale Securities [Line Items]  
Other securities which provide for periodic payments, Amortized Cost 431.3
Other securities which provide for periodic payments, Fair Value 454.3
Structured hybrids
  
Schedule of Available-for-sale Securities [Line Items]  
Other securities which provide for periodic payments, Amortized Cost 27.1
Other securities which provide for periodic payments, Fair Value 29.4
Agency Residential Mortgage Backed Securities
  
Schedule of Available-for-sale Securities [Line Items]  
Other securities which provide for periodic payments, Amortized Cost 96.5
Other securities which provide for periodic payments, Fair Value 98.6
Non-agency residential mortgage-backed securities
  
Schedule of Available-for-sale Securities [Line Items]  
Other securities which provide for periodic payments, Amortized Cost 1,304.0
Other securities which provide for periodic payments, Fair Value 1,368.0
Non-structured Hybrids | Corporate | Municipal | U.S. Government
  
Schedule of Available-for-sale Securities [Line Items]  
Due in one year or less, Amortized Cost 978.5
Due after one year through five years, Amortized Cost 2,739.1
Due after five years through ten years, Amortized Cost 2,972.4
Due after ten years, Amortized Cost 5,007.5
Subtotal, Amortized Cost 11,697.5
Due in one year or less, Fair Value 982.4
Due after one year through five years, Fair Value 2,805.8
Due after five years through ten years, Fair Value 3,000.9
Due after ten years, Fair Value 5,037.5
Subtotal, Fair Value $ 11,826.6