Summary Of Significant Accounting Policies (Summary Of Reinsurance Activity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Summary Of Significant Accounting Policies [Abstract]
Net assumed written premiums	$ 13.7	$ 11.5	$ 44.1	$ 39.8
Net premiums earned	13.1	12.2	38.0	35.0
Provision for claims	11.0	9.1	30.5	26.7
Amortization of capitalized acquisition costs	$ 0.3	$ 0.3	$ 0.9	$ 0.9