Reinsurance (Schedule Of Reinsurance Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reinsurance [Abstract]
Net assumed written premiums	$ 55.8	$ 42.4	$ 40.6
Net premiums earned	46.6	41.1	43.0
Provision for claims	26.0	22.7	26.0
Amortization of capitalized acquisition costs	$ 1.2	$ 1.0	$ 1.1