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Summary Of Significant Accounting Policies (Summary Of Reinsurance Activity) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary Of Significant Accounting Policies [Abstract]        
Net assumed written premiums $ 14.1 $ 12.0 $ 30.4 $ 28.3
Net premiums earned 12.9 12.0 24.9 22.8
Provision for claims 10.5 9.0 19.5 17.6
Amortization of capitalized acquisition costs $ 0.3 $ 0.3 $ 0.6 $ 0.6