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Investments - Schedule of Other Than Temporary Impairment (Details) (Fixed Maturities [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fixed Maturities [Member]
        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance at Beginning of Period $ 12.9 $ 4.4 $ 9.9 $ 4.6
Additions for Previously Unrecognized OTTI Credit Losses 0 0.8 2.4 1.8
Increases to Previously Recognized OTTI Credit Losses 0 1.3 0.6 1.3
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell (2.4) (2.1) (2.4) (3.2)
Reductions for Investments Sold During Period 0 0 0 (0.1)
Balance at End of Period $ 10.5 $ 4.4 $ 10.5 $ 4.4