Summary of Significant Accounting Policies (Summary of Reinsurance Activity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounting Policies [Abstract]
Net assumed written premiums	$ 9.0	$ 10.6	$ 20.9	$ 26.1
Net premiums earned	10.9	12.6	21.7	24.7
Provision for claims	7.0	9.2	13.8	17.8
Amortization of capitalized acquisition costs	$ 0.3	$ 0.2	$ 0.5	$ 0.5