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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Summary of Common Share Activity A summary of common share activity for the years ended December 31 follows (in shares):
202220212020
Common shares outstanding at January 1126,131,799 134,801,030 135,577,878 
Shares repurchased(6,574,610)(9,121,328)(1,240,328)
Restricted stock issued to employees, net of forfeitures370,178 435,129 439,700 
Shares issued to non-employee directors17,935 16,968 23,780 
Common shares outstanding at December 31119,945,302 126,131,799 134,801,030