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Investments - OTTI (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
securities
Dec. 31, 2015
USD ($)
securities
Dec. 31, 2014
USD ($)
securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 19.4 $ 45.9 $ 7.1
No. of Securities | securities 32 45 39
Write-downs related to credit impairments $ 1.9 $ 3.8 $ 1.6
Impairment, Intent-related $ 17.5 $ 42.1 $ 5.5
No. of Securities, Intent-related | securities 7 20 15
U.S. corporate public securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 3.7 $ 8.5 $ 1.7
No. of Securities | securities 2 8 3
Impairment, Intent-related $ 3.7 $ 8.5 $ 1.6
No. of Securities, Intent-related | securities 1 7 3
Foreign corporate public securities and foreign governments      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 12.2 $ 34.2 $ 3.7
No. of Securities | securities 3 9 7
Impairment, Intent-related $ 11.7 $ 32.5 $ 3.7
No. of Securities, Intent-related | securities 2 8 7
Foreign corporate private securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0.7 $ 0.7 $ 0.0
No. of Securities | securities 2 1 0
Impairment, Intent-related $ 0.0 $ 0.0 $ 0.0
No. of Securities, Intent-related | securities 0 0 0
Residential mortgage-backed      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 2.8 $ 2.4 $ 1.6
No. of Securities | securities 25 26 26
Impairment, Intent-related $ 2.1 $ 1.1 $ 0.1
No. of Securities, Intent-related | securities 4 5 3
Commercial mortgage-backed      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0.0 $ 0.0 $ 0.1
No. of Securities | securities 0 0 2
Impairment, Intent-related $ 0.0 $ 0.0 $ 0.1
No. of Securities, Intent-related | securities 0 0 2
Other asset-backed securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0.0 $ 0.1 $ 0.0
No. of Securities | securities 0 1 1
Impairment, Intent-related $ 0.0 $ 0.0 $ 0.0
No. of Securities, Intent-related | securities 0 0 0