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Other Reinsurance Ceded Insurance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effects of Reinsurance [Line Items]      
Ceded to Other Companies $ 19.0 $ 20.6 $ 26.0
Catastrophe Reinsurance [Member]      
Effects of Reinsurance [Line Items]      
Ceded to Other Companies $ 12.0 $ 12.9 $ 17.7