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Fair Value of Financial Instruments Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Carrying amount of policy loans $ 3,222.4   $ 3,222.4   $ 3,276.0
Long-term Debt 2,792.0   2,792.0   2,612.0
Gain on Embedded Derivative 12.4 12.4 20.9 18.8  
Fair Value Inputs Other Than Level 1
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Percentage of Total Fair Value of Fixed Maturities Securities 86.80%   86.80%    
Fair Value, Inputs, Level 1
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Long-term Debt 2,252.3   2,252.3   1,329.2
Percentage of Total Fair Value of Fixed Maturities Securities 13.20%   13.20%    
Fair Value, Inputs, Level 2
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Long-term Debt 834.2   834.2   1,495.2
Fair Value, Inputs, Level 2 | Pricing Service
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Percentage of Total Fair Value of Fixed Maturities Securities 71.10%   71.10%    
Fair Value, Inputs, Level 2 | Other Observable Market Data
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Percentage of Total Fair Value of Fixed Maturities Securities 4.20%   4.20%    
Fair Value Inputs Level 2 Or Level 3
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Percentage of Total Fair Value of Fixed Maturities Securities 11.50%   11.50%    
Ceded Policy Loans
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Carrying amount of policy loans $ 2,987.8   $ 2,987.8   $ 3,043.7
Minimum
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Private Equity Partnership Future Liquidation Term     1 year    
Maximum
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Private Equity Partnership Future Liquidation Term     10 years