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Investments - Schedule of Other Than Temporary Impairment (Details) (Fixed Maturities [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fixed Maturities [Member]
        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance at Beginning of Period $ 10.2 $ 4.1 $ 9.9 $ 4.6
Additions for Previously Unrecognized OTTI Credit Losses 2.4 0.3 2.4 1.0
Increases to Previously Recognized OTTI Credit Losses 0.3 0 0.6 0
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell 0 0 0 1.1
Reductions for Investments Sold During Period 0 0 0 (0.1)
Balance at End of Period $ 12.9 $ 4.4 $ 12.9 $ 4.4