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Summary Of Significant Accounting Policies (Summary Of Reinsurance Activity) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]    
Net assumed written premiums $ 16.3 $ 16.3
Net premiums earned 12.0 10.8
Provision for claims 9.0 8.6
Amortization of capitalized acquisition costs $ 0.3 $ 0.3