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Fair Value of Financial Instruments - Fair Value by Level (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 4,076.2 $ 3,426.3
Assets    
Separate account assets 1,816.3 2,052.7
U.S. government and agency
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 75.1 68.6
State and political subdivision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 198.4 154.6
Foreign government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 68.3 65.5
Corporate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 2,698.2 2,207.3
Commercial mortgage-backed (“CMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 254.9 253.7
Residential mortgage-backed (“RMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 604.4 509.8
Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 92.9 70.9
Other asset-backed (“ABS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 84.0 95.9
Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,076.2 3,426.3
Short-term Investments 0 81.0
Assets    
Derivative assets 144.8 237.8
Fair value investments 47.1 48.6
Separate account assets 1,816.3 2,052.7
Total assets 6,084.4 5,846.4
Liabilities    
Derivative liabilities 70.0 110.8
Embedded derivatives 116.4 74.8
Total liabilities 186.4 185.6
Fair Value, Measurements, Nonrecurring | U.S. government and agency
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 75.1 68.6
Fair Value, Measurements, Nonrecurring | State and political subdivision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 198.4 154.6
Fair Value, Measurements, Nonrecurring | Foreign government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 68.3 65.5
Fair Value, Measurements, Nonrecurring | Corporate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 2,698.2 2,207.3
Fair Value, Measurements, Nonrecurring | Commercial mortgage-backed (“CMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 254.9 253.7
Fair Value, Measurements, Nonrecurring | Residential mortgage-backed (“RMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 604.4 509.8
Fair Value, Measurements, Nonrecurring | Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 92.9 70.9
Fair Value, Measurements, Nonrecurring | Other asset-backed (“ABS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 84.0 95.9
Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Short-term Investments 0 80.0
Assets    
Derivative assets 0.3 12.5
Fair value investments 0 0
Separate account assets 1,816.3 2,052.7
Total assets 1,816.6 2,145.2
Liabilities    
Derivative liabilities 0 0
Embedded derivatives 0 0
Total liabilities 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | U.S. government and agency
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | State and political subdivision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Foreign government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Corporate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial mortgage-backed (“CMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage-backed (“RMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Other asset-backed (“ABS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 2,294.3 1,767.1
Short-term Investments 0 1.0
Assets    
Derivative assets 144.5 225.3
Fair value investments 12.9 13.0
Separate account assets 0 0
Total assets 2,451.7 2,006.4
Liabilities    
Derivative liabilities 70.0 110.8
Embedded derivatives 0 0
Total liabilities 70.0 110.8
Fair Value, Measurements, Nonrecurring | Level 2 | U.S. government and agency
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 9.1 9.8
Fair Value, Measurements, Nonrecurring | Level 2 | State and political subdivision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 37.0 20.8
Fair Value, Measurements, Nonrecurring | Level 2 | Foreign government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 64.9 62.2
Fair Value, Measurements, Nonrecurring | Level 2 | Corporate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,470.4 1,105.0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial mortgage-backed (“CMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 252.2 221.8
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage-backed (“RMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 448.3 333.9
Fair Value, Measurements, Nonrecurring | Level 2 | Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Other asset-backed (“ABS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 12.4 13.6
Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,781.9 1,659.2
Short-term Investments 0 0
Assets    
Derivative assets 0 0
Fair value investments 34.2 35.6
Separate account assets 0 0
Total assets 1,816.1 1,694.8
Liabilities    
Derivative liabilities 0 0
Embedded derivatives 116.4 74.8
Total liabilities 116.4 74.8
Fair Value, Measurements, Nonrecurring | Level 3 | U.S. government and agency
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 66.0 58.8
Fair Value, Measurements, Nonrecurring | Level 3 | State and political subdivision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 161.4 133.8
Fair Value, Measurements, Nonrecurring | Level 3 | Foreign government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 3.4 3.3
Fair Value, Measurements, Nonrecurring | Level 3 | Corporate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,227.8 1,102.3
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial mortgage-backed (“CMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 2.7 31.9
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage-backed (“RMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 156.1 175.9
Fair Value, Measurements, Nonrecurring | Level 3 | Collateralized debt obligation (“CDO”) / collateralized loan obligation (“CLO”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 92.9 70.9
Fair Value, Measurements, Nonrecurring | Level 3 | Other asset-backed (“ABS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 71.6 $ 82.3