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Reinsurance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Historical Average Claims Ratios, Period, Minimum     5 years  
Historical Average Claims Ratios, Period, Maximum     10 years  
Hollenfels        
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Share of incurred and paid claims $ 1.9 $ 1.5 $ 9.6 $ 2.6
Share of claims incurred but not reported $ 0.5   $ 9.0