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Fair Value of Financial Instruments - Carrying Amounts and Fair Values (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Level 3 | Policy Loans
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value $ 65.6 $ 61.0
Fair Value 65.1 60.6
Level 3 | Investment Contracts
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 2,660.9 2,349.8
Fair Value 2,662.0 2,355.4
Level 1 | Cash and Cash Equivalents
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Value 218.1 83.1
Fair Value $ 218.1 $ 83.1