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Fair Value Measurements by Input Level (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fixed Maturity Securities    
Fixed Maturity Securities $ 42,344.4 $ 44,973.0
Other Long-term Investments    
Equity Securities 16.4 14.6
Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,523.3 2,218.4
Other Long-term Investments    
Equity Securities 0 0
Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 37,480.6 40,766.3
Other Long-term Investments    
Equity Securities 11.8 10.3
Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,340.5 1,988.3
Other Long-term Investments    
Equity Securities 4.6 4.3
Interest Rate Swaps
   
Other Long-term Investments    
Derivative Assets 9.2 76.5
Other Liabilities    
Derivative Liabilities 35.0 31.7
Interest Rate Swaps | Fair Value, Inputs, Level 1
   
Other Long-term Investments    
Derivative Assets 0 0
Other Liabilities    
Derivative Liabilities 0 0
Interest Rate Swaps | Fair Value, Inputs, Level 2
   
Other Long-term Investments    
Derivative Assets 9.2 76.5
Other Liabilities    
Derivative Liabilities 35.0 31.7
Interest Rate Swaps | Fair Value, Inputs, Level 3
   
Other Long-term Investments    
Derivative Assets 0 0
Other Liabilities    
Derivative Liabilities 0 0
Foreign Exchange Contracts
   
Other Long-term Investments    
Derivative Assets 1.6 5.1
Other Liabilities    
Derivative Liabilities 98.7 138.8
Foreign Exchange Contracts | Fair Value, Inputs, Level 1
   
Other Long-term Investments    
Derivative Assets 0 0
Other Liabilities    
Derivative Liabilities 0 0
Foreign Exchange Contracts | Fair Value, Inputs, Level 2
   
Other Long-term Investments    
Derivative Assets 1.6 5.1
Other Liabilities    
Derivative Liabilities 98.7 138.8
Foreign Exchange Contracts | Fair Value, Inputs, Level 3
   
Other Long-term Investments    
Derivative Assets 0 0
Other Liabilities    
Derivative Liabilities 0 0
Derivative Assets
   
Other Long-term Investments    
Derivative Assets 10.8 81.6
Derivative Assets | Fair Value, Inputs, Level 1
   
Other Long-term Investments    
Derivative Assets 0 0
Derivative Assets | Fair Value, Inputs, Level 2
   
Other Long-term Investments    
Derivative Assets 10.8 81.6
Derivative Assets | Fair Value, Inputs, Level 3
   
Other Long-term Investments    
Derivative Assets 0 0
Credit Default Swaps
   
Other Liabilities    
Derivative Liabilities 1.9  
Credit Default Swaps | Fair Value, Inputs, Level 1
   
Other Liabilities    
Derivative Liabilities 0  
Credit Default Swaps | Fair Value, Inputs, Level 2
   
Other Liabilities    
Derivative Liabilities 1.9  
Credit Default Swaps | Fair Value, Inputs, Level 3
   
Other Liabilities    
Derivative Liabilities 0  
Embedded Derivative in Modified Coinsurance Arrangement
   
Other Liabilities    
Derivative Liabilities 53.2 83.9
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 1
   
Other Liabilities    
Derivative Liabilities 0 0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 2
   
Other Liabilities    
Derivative Liabilities 0 0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Inputs, Level 3
   
Other Liabilities    
Derivative Liabilities 53.2 83.9
Derivative Liabilities
   
Other Liabilities    
Derivative Liabilities 188.8 254.4
Derivative Liabilities | Fair Value, Inputs, Level 1
   
Other Liabilities    
Derivative Liabilities 0 0
Derivative Liabilities | Fair Value, Inputs, Level 2
   
Other Liabilities    
Derivative Liabilities 135.6 170.5
Derivative Liabilities | Fair Value, Inputs, Level 3
   
Other Liabilities    
Derivative Liabilities 53.2 83.9
United States Government and Government Agencies and Authorities
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,196.1 1,348.8
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 144.5 104.1
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,051.6 1,244.7
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 1,783.2 1,806.8
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 53.0
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,608.1 1,625.1
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 175.1 128.7
Foreign Government Debt Securities
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,373.2 1,507.0
Foreign Government Debt Securities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 0 0
Foreign Government Debt Securities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,294.7 1,424.9
Foreign Government Debt Securities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 78.5 82.1
Public Utilities
   
Fixed Maturity Securities    
Fixed Maturity Securities 10,403.0 11,144.2
Public Utilities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 396.8 84.2
Public Utilities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 9,802.7 10,485.6
Public Utilities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 203.5 574.4
Mortgage/Asset-backed Securities
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,039.3 2,216.5
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 2,038.8 2,216.0
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 0.5 0.5
All Other Corporate Bonds
   
Fixed Maturity Securities    
Fixed Maturity Securities 25,511.9 26,910.4
All Other Corporate Bonds | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,982.0 1,977.1
All Other Corporate Bonds | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 21,670.8 23,755.5
All Other Corporate Bonds | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,859.1 1,177.8
Redeemable Preferred Stocks
   
Fixed Maturity Securities    
Fixed Maturity Securities 37.7 39.3
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 13.9 14.5
Redeemable Preferred Stocks | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities $ 23.8 $ 24.8