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Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Insurance [Abstract]    
Net assumed written premiums $ 15.8 $ 16.2
Net premiums earned 12.2 10.3
Provision for claims 6.6 5.2
Amortization of capitalized acquisition costs $ 0.3 $ 0.3