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Reinsurance Reinsurance (Summary of Reinsurance Activity) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Insurance [Abstract]        
Net assumed written premiums $ 9.6 $ 9.0 $ 21.9 $ 20.9
Net premiums earned 10.5 10.9 20.6 21.7
Provision for claims 6.1 7.0 12.1 13.8
Amortization of capitalized acquisition costs $ 0.2 $ 0.3 $ 0.5 $ 0.5