Reinsurance (Schedule Of Reinsurance Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reinsurance [Abstract]
Net assumed written premiums	$ 51.8	$ 55.8	$ 42.4
Net premiums earned	51.0	46.6	41.1
Provision for claims	30.1	26.0	22.7
Amortization of capitalized acquisition costs	$ 1.3	$ 1.2	$ 1.0