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Fair Value of Financial Instruments - Fair Value by Level (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities $ 3,162.2   $ 2,972.3
Assets      
Related party reinsurance derivative asset   0 0
Separate account assets 2,021.3   2,061.8
Level 1
      
Assets      
Related party reinsurance derivative asset 0   0
Level 2
      
Assets      
Related party reinsurance derivative asset 0   0
Level 3
      
Assets      
Related party reinsurance derivative asset   0 0
Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 3,162.2   2,972.3
Short-term Investments, Fair Value Disclosure 165.0   244.9
Derivative assets 199.3   149.4
Assets      
Fair value investments 48.8   38.5
Separate account assets 2,021.3   2,061.8
Total assets 5,596.6   5,466.9
Liabilities      
Derivative liabilities 77.4   45.7
Embedded derivatives 76.9   79.5
Total liabilities 154.3   125.2
Fair Value, Measurements, Nonrecurring | Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0   0
Short-term Investments, Fair Value Disclosure 165.0   244.9
Derivative assets 16.4   13.8
Assets      
Fair value investments      0
Separate account assets 2,021.3   2,061.8
Total assets 2,202.7   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]      
Available-for-sale Securities, Debt Securities 1,674.1   1,642.0
Short-term Investments, Fair Value Disclosure 0   0
Derivative assets 182.9   135.6
Assets      
Fair value investments 14.4   15.8
Separate account assets 0   0
Total assets 1,871.4   1,793.4
Liabilities      
Derivative liabilities 77.4   45.7
Embedded derivatives 0   0
Total liabilities 77.4   45.7
Fair Value, Measurements, Nonrecurring | Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,488.1   1,330.3
Short-term Investments, Fair Value Disclosure 0   0
Derivative assets 0   0
Assets      
Fair value investments 34.4   22.7
Separate account assets 0   0
Total assets 1,522.5   1,353.0
Liabilities      
Derivative liabilities 0   0
Embedded derivatives 76.9   79.5
Total liabilities 76.9   79.5
U.S. government and agency
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 61.0   40.2
U.S. government and agency | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 61.0   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]      
Available-for-sale Securities, Debt Securities 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]      
Available-for-sale Securities, Debt Securities 13.9   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]      
Available-for-sale Securities, Debt Securities 47.1   25.9
State and political subdivision
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 124.9   130.9
State and political subdivision | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 124.9   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]      
Available-for-sale Securities, Debt Securities 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]      
Available-for-sale Securities, Debt Securities 20.6   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]      
Available-for-sale Securities, Debt Securities 104.3   116.1
Foreign government
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 45.5   51.8
Foreign government | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 45.6   51.8
Foreign government | Fair Value, Measurements, Nonrecurring | Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0   0
Foreign government | Fair Value, Measurements, Nonrecurring | Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 42.3   43.8
Foreign government | Fair Value, Measurements, Nonrecurring | Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 3.3   8.0
Corporate
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 2,055.7   1,897.5
Corporate | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 2,055.7   1,897.5
Corporate | Fair Value, Measurements, Nonrecurring | Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0   0
Corporate | Fair Value, Measurements, Nonrecurring | Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 1,099.8   1,096.0
Corporate | Fair Value, Measurements, Nonrecurring | Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 955.9   801.5
Commercial mortgage-backed (CMBS)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 251.4   254.0
Commercial mortgage-backed (CMBS) | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 251.4   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]      
Available-for-sale Securities, Debt Securities 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]      
Available-for-sale Securities, Debt Securities 217.9   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]      
Available-for-sale Securities, Debt Securities 33.5   19.3
Residential mortgage-backed (RMBS)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 459.8   422.5
Residential mortgage-backed (RMBS) | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 459.8   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]      
Available-for-sale Securities, Debt Securities 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]      
Available-for-sale Securities, Debt Securities 257.3   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]      
Available-for-sale Securities, Debt Securities 202.5   222.6
CDO/CLO
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 67.7   56.8
CDO/CLO | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 67.6   56.8
CDO/CLO | Fair Value, Measurements, Nonrecurring | Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0   0
CDO/CLO | Fair Value, Measurements, Nonrecurring | Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0   0
CDO/CLO | Fair Value, Measurements, Nonrecurring | Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 67.6   56.8
Other asset-backed
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 96.2   118.6
Other asset-backed | Fair Value, Measurements, Nonrecurring
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 96.2   118.6
Other asset-backed | Fair Value, Measurements, Nonrecurring | Level 1
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 0   0
Other asset-backed | Fair Value, Measurements, Nonrecurring | Level 2
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities 22.3   38.5
Other asset-backed | Fair Value, Measurements, Nonrecurring | Level 3
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Securities $ 73.9   $ 80.1