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Goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Goodwill $ 323.0 $ 323.0
Property and Casualty Insurance [Member]    
Goodwill [Roll Forward]    
Goodwill 103.6 103.6
Life and Health Insurance [Member]    
Goodwill [Roll Forward]    
Goodwill $ 219.4 $ 219.4