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Fair Value Measurements by Input Level (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fixed Maturity Securities    
Fixed Maturity Securities $ 43,666.8 $ 42,344.4
Other Long-term Investments    
Equity Securities 15.1 16.4
Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 4,810.9 2,523.3
Other Long-term Investments    
Equity Securities 0 0
Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 36,811.0 37,480.6
Other Long-term Investments    
Equity Securities 12.0 11.8
Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,044.9 2,340.5
Other Long-term Investments    
Equity Securities 3.1 4.6
Interest Rate Swaps
   
Other Long-term Investments    
Derivative Assets 8.1 9.2
Other Liabilities    
Derivative Liabilities 30.9 35.0
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 8.1 9.2
Other Liabilities    
Derivative Liabilities 30.9 35.0
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 2.8 1.6
Other Liabilities    
Derivative Liabilities 84.8 98.7
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 2.8 1.6
Other Liabilities    
Derivative Liabilities 84.8 98.7
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 10.9 10.8
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 10.9 10.8
Derivative Assets | Fair Value, Inputs, Level 3
   
Other Long-term Investments    
Derivative Assets 0 0
Credit Default Swaps
   
Other Liabilities    
Derivative Liabilities 2.0 1.9
Credit Default Swaps | Fair Value, Inputs, Level 1
   
Other Liabilities    
Derivative Liabilities 0 0
Credit Default Swaps | Fair Value, Inputs, Level 2
   
Other Liabilities    
Derivative Liabilities 2.0 1.9
Credit Default Swaps | Fair Value, Inputs, Level 3
   
Other Liabilities    
Derivative Liabilities 0 0
Embedded Derivative in Modified Coinsurance Arrangement
   
Other Liabilities    
Derivative Liabilities 44.7 53.2
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 44.7 53.2
Derivative Liabilities
   
Other Liabilities    
Derivative Liabilities 162.4 188.8
Derivative Liabilities | Fair Value, Inputs, Level 1
   
Other Liabilities    
Derivative Liabilities 0 0
Derivative Liabilities | Fair Value, Inputs, Level 2
   
Other Liabilities    
Derivative Liabilities 117.7 135.6
Derivative Liabilities | Fair Value, Inputs, Level 3
   
Other Liabilities    
Derivative Liabilities 44.7 53.2
United States Government and Government Agencies and Authorities
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,156.7 1,196.1
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 189.2 144.5
United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 967.5 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 1,926.8 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 1,770.7 1,608.1
States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 156.1 175.1
Foreign Governments
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,371.0 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 1,290.6 1,294.7
Foreign Governments | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 80.4 78.5
Public Utilities
   
Fixed Maturity Securities    
Fixed Maturity Securities 10,803.1 10,403.0
Public Utilities | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 709.4 396.8
Public Utilities | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 9,783.7 9,802.7
Public Utilities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 310.0 203.5
Mortgage/Asset-backed Securities
   
Fixed Maturity Securities    
Fixed Maturity Securities 2,286.7 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 2,286.3 2,038.8
Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 0.4 0.5
All Other Corporate Bonds
   
Fixed Maturity Securities    
Fixed Maturity Securities 26,084.1 25,511.9
All Other Corporate Bonds | Fair Value, Inputs, Level 1
   
Fixed Maturity Securities    
Fixed Maturity Securities 3,912.3 1,982.0
All Other Corporate Bonds | Fair Value, Inputs, Level 2
   
Fixed Maturity Securities    
Fixed Maturity Securities 20,698.2 21,670.8
All Other Corporate Bonds | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities 1,473.6 1,859.1
Redeemable Preferred Stocks
   
Fixed Maturity Securities    
Fixed Maturity Securities 38.4 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 14.0 13.9
Redeemable Preferred Stocks | Fair Value, Inputs, Level 3
   
Fixed Maturity Securities    
Fixed Maturity Securities $ 24.4 $ 23.8