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Summary Of Significant Accounting Policies (Summary Of Reinsurance Activity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Net assumed written premiums	$ 50.5	$ 47.6	$ 34.5
Net premiums earned	47.1	40.0	32.7
Provision for claims	34.8	30.4	23.4
Amortization of capitalized acquisition costs	$ 1.3	$ 1.0	$ 0.8

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.

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