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Fair Value of Financial Instruments - Carrying Amounts and Fair Values (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Level 3 | Policy loans
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value $ 66.3 $ 66.1
Fair Value 65.8 65.6
Level 3 | Investment contracts
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 3,004.6 2,762.8
Fair Value 3,005.8 2,763.8
Level 3 | Surplus Note | Surplus Note | Reported Value Measurement
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Payable, Fair Value Disclosure 30.0 30.0
Level 3 | Surplus Note | Surplus Note | Estimate of Fair Value Measurement
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Payable, Fair Value Disclosure 30.0 30.0
Level 1 | Cash and cash equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 154.9 181.0
Fair Value $ 154.9 $ 181.0