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Fair Value of Financial Instruments - Fair Value by Level (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 3,252.1 $ 2,972.3
Assets    
Separate account assets 2,049.5 2,061.8
Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 3,252.1 2,972.3
Short-term Investments 55.0 244.9
Assets    
Derivative assets 190.7 149.4
Related party reinsurance derivative asset 0 0
Fair value investments 53.1 38.5
Separate account assets 2,049.5 2,061.8
Total assets 5,600.4 5,466.9
Liabilities    
Derivative liabilities 82.7 45.7
Embedded derivatives 72.6 79.5
Total liabilities 155.3 125.2
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 55.0 244.9
Assets    
Derivative assets 15.3 13.8
Related party reinsurance derivative asset 0 0
Fair value investments 0 0
Separate account assets 2,049.5 2,061.8
Total assets 2,119.8 2,320.5
Liabilities    
Derivative liabilities 0 0
Embedded derivatives 0 0
Total liabilities 0 0
Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,670.0 1,642.0
Short-term Investments 0 0
Assets    
Derivative assets 175.4 135.6
Related party reinsurance derivative asset 0 0
Fair value investments 13.7 15.8
Separate account assets 0 0
Total assets 1,859.1 1,793.4
Liabilities    
Derivative liabilities 82.7 45.7
Embedded derivatives 0 0
Total liabilities 82.7 45.7
Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,582.1 1,330.3
Short-term Investments 0 0
Assets    
Derivative assets 0 0
Related party reinsurance derivative asset 0 0
Fair value investments 39.4 22.7
Separate account assets 0 0
Total assets 1,621.5 1,353.0
Liabilities    
Derivative liabilities 0 0
Embedded derivatives 72.6 79.5
Total liabilities 72.6 79.5
U.S. government and agency
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 72.5 40.2
U.S. government and agency | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 72.5 40.2
U.S. government and agency | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
U.S. government and agency | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 13.4 14.3
U.S. government and agency | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 59.1 25.9
State and political subdivision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 144.3 130.9
State and political subdivision | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 144.3 130.9
State and political subdivision | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
State and political subdivision | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 19.9 14.8
State and political subdivision | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 124.4 116.1
Foreign government
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 59.2 51.8
Foreign government | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 59.2 51.8
Foreign government | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Foreign government | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 55.9 43.8
Foreign government | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 3.3 8.0
Corporate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 2,123.1 1,897.5
Corporate | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 2,123.1 1,897.5
Corporate | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Corporate | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,107.9 1,096.0
Corporate | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 1,015.2 801.5
Commercial mortgage-backed (“CMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 254.3 254.0
Commercial mortgage-backed (“CMBS”) | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 254.3 254.0
Commercial mortgage-backed (“CMBS”) | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Commercial mortgage-backed (“CMBS”) | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 213.1 234.7
Commercial mortgage-backed (“CMBS”) | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 41.2 19.3
Residential mortgage-backed (“RMBS”)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 432.6 422.5
Residential mortgage-backed (“RMBS”) | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 432.6 422.5
Residential mortgage-backed (“RMBS”) | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Residential mortgage-backed (“RMBS”) | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 242.2 199.9
Residential mortgage-backed (“RMBS”) | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 190.4 222.6
CDO/CLO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 66.7 56.8
CDO/CLO | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 66.7 56.8
CDO/CLO | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
CDO/CLO | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
CDO/CLO | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 66.7 56.8
Other asset-backed
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 99.4 118.6
Other asset-backed | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 99.4 118.6
Other asset-backed | Fair Value, Measurements, Nonrecurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Other asset-backed | Fair Value, Measurements, Nonrecurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 17.6 38.5
Other asset-backed | Fair Value, Measurements, Nonrecurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 81.8 $ 80.1