Reinsurance (Schedule Of Reinsurance Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance [Abstract]
Net assumed written premiums	$ 40.6	$ 45.0	$ 48.3
Net premiums earned	43.0	48.2	52.3
Provision for claims	26.0	33.2	40.0
Amortization of capitalized acquisition costs	$ 1.1	$ 1.2	$ 1.3