Common Stock Issued and Outstanding (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 is shown below.

(Number of shares outstanding)	2020	2019	2018
Beginning of year	152,935,361	173,058,829	172,572,873
Stock options exercised  1	11,359	12,345	21,200
Restricted stock awards  1	651,905	561,729	464,756
Treasury shares purchased	—	(20,697,542)	—
End of year	153,598,625	152,935,361	173,058,829

1 Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note K due to withholdings for statutory income taxes owed upon issuance of shares.