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Fair Value of Financial Instruments - Fair Value by Level (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Assets    
Available-for-sale debt securities, fair value $ 4,326.7 $ 4,221.8
Available-for-sale equity securities, fair value 27.6 28.7
Fair value investments 38.3 46.7
Separate account assets 1,625.1 1,757.5
Liabilities    
Derivative liabilities 54.3 85.6
U.S. government and agency    
Assets    
Available-for-sale debt securities, fair value 95.3 89.3
State and political subdivision    
Assets    
Available-for-sale debt securities, fair value 242.8 229.2
Foreign government    
Assets    
Available-for-sale debt securities, fair value 78.9 73.8
Corporate    
Assets    
Available-for-sale debt securities, fair value 3,098.6 2,831.9
Commercial mortgage-backed (“CMBS”)    
Assets    
Available-for-sale debt securities, fair value 254.2 255.6
Residential mortgage-backed (“RMBS”)    
Assets    
Available-for-sale debt securities, fair value 330.0 576.4
Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)    
Assets    
Available-for-sale debt securities, fair value 139.4 83.5
Other asset-backed (“ABS”)    
Assets    
Available-for-sale debt securities, fair value 87.5 82.1
Level 3    
Assets    
Fair value, assets 2,175.1 2,146.8
Liabilities    
Fair value, liabilities 175.4 160.3
Fair Value, Measurements, Recurring    
Assets    
Available-for-sale debt securities, fair value 4,326.7 4,221.8
Available-for-sale equity securities, fair value 27.6 28.7
Short-term investments 20.0 79.8
Derivative assets 99.1 157.5
Fair value investments 38.3 46.7
Separate account assets 1,625.1 1,757.5
Fair value, assets 6,136.8 6,292.0
Liabilities    
Derivative liabilities 54.3 85.6
Fair value, liabilities 229.7 245.9
Fair Value, Measurements, Recurring | U.S. government and agency    
Assets    
Available-for-sale debt securities, fair value 95.3 89.3
Fair Value, Measurements, Recurring | State and political subdivision    
Assets    
Available-for-sale debt securities, fair value 242.8 229.2
Fair Value, Measurements, Recurring | Foreign government    
Assets    
Available-for-sale debt securities, fair value 78.9 73.8
Fair Value, Measurements, Recurring | Corporate    
Assets    
Available-for-sale debt securities, fair value 3,098.6 2,831.9
Fair Value, Measurements, Recurring | Commercial mortgage-backed (“CMBS”)    
Assets    
Available-for-sale debt securities, fair value 254.2 255.6
Fair Value, Measurements, Recurring | Residential mortgage-backed (“RMBS”)    
Assets    
Available-for-sale debt securities, fair value 330.0 576.4
Fair Value, Measurements, Recurring | Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)    
Assets    
Available-for-sale debt securities, fair value 139.4 83.5
Fair Value, Measurements, Recurring | Other asset-backed (“ABS”)    
Assets    
Available-for-sale debt securities, fair value 87.5 82.1
Fair Value, Measurements, Recurring | Embedded derivatives    
Liabilities    
Derivative liabilities 175.4 160.3
Fair Value, Measurements, Recurring | Level 1    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Available-for-sale equity securities, fair value 0.0 0.0
Short-term investments 20.0 79.8
Derivative assets 0.1 0.0
Fair value investments 0.0 0.0
Separate account assets 1,625.1 1,757.5
Fair value, assets 1,645.2 1,837.3
Liabilities    
Derivative liabilities 0.0 0.5
Fair value, liabilities 0.0 0.5
Fair Value, Measurements, Recurring | Level 1 | U.S. government and agency    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | State and political subdivision    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Foreign government    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Corporate    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed (“CMBS”)    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed (“RMBS”)    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other asset-backed (“ABS”)    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Embedded derivatives    
Liabilities    
Derivative liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 2    
Assets    
Available-for-sale debt securities, fair value 2,208.6 2,137.4
Available-for-sale equity securities, fair value 0.0 0.0
Short-term investments 0.0 0.0
Derivative assets 99.0 157.5
Fair value investments 8.9 13.0
Separate account assets 0.0 0.0
Fair value, assets 2,316.5 2,307.9
Liabilities    
Derivative liabilities 54.3 85.1
Fair value, liabilities 54.3 85.1
Fair Value, Measurements, Recurring | Level 2 | U.S. government and agency    
Assets    
Available-for-sale debt securities, fair value 9.2 9.1
Fair Value, Measurements, Recurring | Level 2 | State and political subdivision    
Assets    
Available-for-sale debt securities, fair value 39.2 35.9
Fair Value, Measurements, Recurring | Level 2 | Foreign government    
Assets    
Available-for-sale debt securities, fair value 68.2 57.7
Fair Value, Measurements, Recurring | Level 2 | Corporate    
Assets    
Available-for-sale debt securities, fair value 1,635.3 1,414.7
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed (“CMBS”)    
Assets    
Available-for-sale debt securities, fair value 245.3 191.0
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed (“RMBS”)    
Assets    
Available-for-sale debt securities, fair value 194.6 424.8
Fair Value, Measurements, Recurring | Level 2 | Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)    
Assets    
Available-for-sale debt securities, fair value 0.0 0.0
Fair Value, Measurements, Recurring | Level 2 | Other asset-backed (“ABS”)    
Assets    
Available-for-sale debt securities, fair value 16.8 4.2
Fair Value, Measurements, Recurring | Level 2 | Embedded derivatives    
Liabilities    
Derivative liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 3    
Assets    
Available-for-sale debt securities, fair value 2,118.1 2,084.4
Available-for-sale equity securities, fair value 27.6 28.7
Short-term investments 0.0 0.0
Derivative assets 0.0 0.0
Fair value investments 29.4 33.7
Separate account assets 0.0 0.0
Fair value, assets 2,175.1 2,146.8
Liabilities    
Derivative liabilities 0.0 0.0
Fair value, liabilities 175.4 160.3
Fair Value, Measurements, Recurring | Level 3 | U.S. government and agency    
Assets    
Available-for-sale debt securities, fair value 86.1 80.2
Fair Value, Measurements, Recurring | Level 3 | State and political subdivision    
Assets    
Available-for-sale debt securities, fair value 203.6 193.3
Fair Value, Measurements, Recurring | Level 3 | Foreign government    
Assets    
Available-for-sale debt securities, fair value 10.7 16.1
Fair Value, Measurements, Recurring | Level 3 | Corporate    
Assets    
Available-for-sale debt securities, fair value 1,463.3 1,417.2
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed (“CMBS”)    
Assets    
Available-for-sale debt securities, fair value 8.9 64.6
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed (“RMBS”)    
Assets    
Available-for-sale debt securities, fair value 135.4 151.6
Fair Value, Measurements, Recurring | Level 3 | Collateralized debt obligations (“CDO”) / collateralized loan obligations (“CLO”)    
Assets    
Available-for-sale debt securities, fair value 139.4 83.5
Fair Value, Measurements, Recurring | Level 3 | Other asset-backed (“ABS”)    
Assets    
Available-for-sale debt securities, fair value 70.7 77.9
Fair Value, Measurements, Recurring | Level 3 | Embedded derivatives    
Liabilities    
Derivative liabilities $ 175.4 $ 160.3