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Fair Value Measurements by Fair Value Heirarchy Input Level (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fixed Maturity Securities    
Fixed Maturity Securities $ 44,715.2 $ 42,344.4
Other Long-term Investments    
Equity Securities 14.7 16.4
Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 7,534.8 2,523.3
Other Long-term Investments    
Equity Securities 0 0
Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 35,377.3 37,480.6
Other Long-term Investments    
Equity Securities 11.6 11.8
Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,803.1 2,340.5
Other Long-term Investments    
Equity Securities 3.1 4.6
Interest Rate Swaps
   
Derivative Asset    
Derivative Assets 6.1 9.2
Derivative Liability    
Derivative Liabilities 25.7 35.0
Interest Rate Swaps | Fair Value, Inputs, Level 1
   
Derivative Asset    
Derivative Assets 0 0
Derivative Liability    
Derivative Liabilities 0 0
Interest Rate Swaps | Fair Value, Inputs, Level 2
   
Derivative Asset    
Derivative Assets 6.1 9.2
Derivative Liability    
Derivative Liabilities 25.7 35.0
Interest Rate Swaps | Fair Value, Inputs, Level 3
   
Derivative Asset    
Derivative Assets 0 0
Derivative Liability    
Derivative Liabilities 0 0
Foreign Exchange Contracts
   
Derivative Asset    
Derivative Assets 9.0 1.6
Derivative Liability    
Derivative Liabilities 79.6 98.7
Foreign Exchange Contracts | Fair Value, Inputs, Level 1
   
Derivative Asset    
Derivative Assets 0 0
Derivative Liability    
Derivative Liabilities 0 0
Foreign Exchange Contracts | Fair Value, Inputs, Level 2
   
Derivative Asset    
Derivative Assets 9.0 1.6
Derivative Liability    
Derivative Liabilities 79.6 98.7
Foreign Exchange Contracts | Fair Value, Inputs, Level 3
   
Derivative Asset    
Derivative Assets 0 0
Derivative Liability    
Derivative Liabilities 0 0
Derivative Assets
   
Derivative Asset    
Derivative Assets 15.1 10.8
Derivative Assets | Fair Value, Inputs, Level 1
   
Derivative Asset    
Derivative Assets 0 0
Derivative Assets | Fair Value, Inputs, Level 2
   
Derivative Asset    
Derivative Assets 15.1 10.8
Derivative Assets | Fair Value, Inputs, Level 3
   
Derivative Asset    
Derivative Assets 0 0
Credit Default Swaps
   
Derivative Liability    
Derivative Liabilities 1.9 1.9
Credit Default Swaps | Fair Value, Inputs, Level 1
   
Derivative Liability    
Derivative Liabilities 0 0
Credit Default Swaps | Fair Value, Inputs, Level 2
   
Derivative Liability    
Derivative Liabilities 1.9 1.9
Credit Default Swaps | Fair Value, Inputs, Level 3
   
Derivative Liability    
Derivative Liabilities 0 0
Embedded Derivative in Modified Coinsurance Arrangement
   
Derivative Liability    
Derivative Liabilities 34.6 53.2
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 1
   
Derivative Liability    
Derivative Liabilities 0 0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 2
   
Derivative Liability    
Derivative Liabilities 0 0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 3
   
Derivative Liability    
Derivative Liabilities 34.6 53.2
Derivative Liabilities
   
Derivative Liability    
Derivative Liabilities 141.8 188.8
Derivative Liabilities | Fair Value, Inputs, Level 1
   
Derivative Liability    
Derivative Liabilities 0 0
Derivative Liabilities | Fair Value, Inputs, Level 2
   
Derivative Liability    
Derivative Liabilities 107.2 135.6
Derivative Liabilities | Fair Value, Inputs, Level 3
   
Derivative Liability    
Derivative Liabilities 34.6 53.2
United States Government and Government Agencies and Authorities
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,196.4 1,196.1
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 291.2 144.5
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 905.2 1,051.6
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 0
States, Municipalities, and Political Subdivisions
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,042.6 1,783.2
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 0
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,908.5 1,608.1
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 134.1 175.1
Foreign Governments
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,346.7 1,373.2
Foreign Governments | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 0
Foreign Governments | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,310.2 1,294.7
Foreign Governments | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 36.5 78.5
Public Utilities
   
Fixed Maturity Securities    
Fixed Maturity Securities 8,434.6 7,997.2
Public Utilities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 744.5 246.0
Public Utilities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 7,450.4 7,611.9
Public Utilities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 239.7 139.3
Mortgage/Asset-backed Securities
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,501.7 2,039.3
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 0
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,492.5 2,038.8
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 9.2 0.5
All Other Corporate Bonds
   
Fixed Maturity Securities    
Fixed Maturity Securities 29,143.1 27,917.7
All Other Corporate Bonds | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 6,499.1 2,132.8
All Other Corporate Bonds | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 21,285.3 23,861.6
All Other Corporate Bonds | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,358.7 1,923.3
Redeemable Preferred Stocks
   
Fixed Maturity Securities    
Fixed Maturity Securities 50.1 37.7
Redeemable Preferred Stocks | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 0
Redeemable Preferred Stocks | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 25.2 13.9
Redeemable Preferred Stocks | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities $ 24.9 $ 23.8