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Common Stock Issued and Outstanding (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Activity in Number of Shares of Common Stock Issued and Outstanding
Activity in the number of shares of Common Stock issued and outstanding for the three years ended December 31, 2021 is shown below.
(Number of shares outstanding)
202120202019
Beginning of year153,598,625 152,935,361 173,058,829 
Stock options exercised  1
32,554 11,359 12,345 
Restricted stock awards  1
831,871 651,905 561,729 
Treasury shares purchased— — (20,697,542)
End of year154,463,050 153,598,625 152,935,361 
1 Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note J due to withholdings for statutory income taxes owed upon issuance of shares.