Reinsurance (Summary of Reinsurance Activity) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Insurance [Abstract]
Net assumed written premiums	$ 18.8	$ 12.1	$ 55.6	$ 45.9
Net premiums earned	16.4	15.4	45.6	45.6
Provision for claims	12.9	10.0	34.0	29.3
Amortization of capitalized acquisition costs	$ 0.3	$ 0.2	$ 1.1	$ 1.0