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Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2021
Risks and Uncertainties [Abstract]  
Schedule Of Gross Written Premium From Major Brokers The following table shows the largest brokers that the Company transacted business within the three years ended December 31, 2021 and the proportion of gross written premiums from each of those brokers.
 Twelve Months Ended December 31,
 202120202019
(in percentages)
Aon Corporation17.3 %15.8 %13.4 %
Marsh & McLennan Companies, Inc.17.5 15.4 13.6 
Willis Group Holdings, Ltd.9.6 10.4 10.3 
Other brokers/non-broker sources (1)
55.6 58.4 62.7 
Total
100.0 %100.0 %100.0 %
Gross written premiums ($ millions)$3,938.4 $3,698.5 $3,442.4 
 ______________
(1)    No other individual broker accounted for more than 10% of total gross written premiums.