Capital Stock (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Common Shares in Treasury and Common Shares Outstanding

	Shares in Treasury	Shares Outstanding
Balance at January 1, 2020	81,866,907	276,434,517
Shares issued for exercise of option rights		2,873,646
Shares tendered as payment for option rights exercised	10,140	(10,140)
Shares issued for vesting of restricted stock units		386,685
Shares tendered in connection with vesting of restricted stock units	133,077	(133,077)
Treasury stock purchased	11,700,000	(11,700,000)
Treasury stock retired	(91,746,432)
Treasury stock sold (1)	(825,000)	825,000
Balance at December 31, 2020	1,138,692	268,676,631
Shares issued for exercise of option rights		2,365,168
Shares tendered as payment for option rights exercised	4,324	(4,324)
Shares issued for vesting of restricted stock units		276,948
Shares tendered in connection with vesting of restricted stock units	95,618	(95,618)
Treasury stock purchased	10,075,000	(10,075,000)
Balance at December 31, 2021	11,313,634	261,143,805
Shares issued for exercise of option rights		778,075
Shares tendered as payment for option rights exercised	3,861	(3,861)
Shares issued for vesting of restricted stock units		357,832
Shares tendered in connection with vesting of restricted stock units	124,852	(124,852)
Treasury stock purchased	3,350,000	(3,350,000)
Treasury stock sold (1)	(75,000)	75,000
Balance at December 31, 2022	14,717,347	258,875,999

(1)    During the years ended December 31, 2020 and 2022, the Company sold treasury shares to fund Company contributions to the domestic defined contribution plan. The related proceeds were $182.4 million and $22.0 million, respectively.