Capital Stock (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Common Shares in Treasury and Common Shares Outstanding

	Shares in Treasury	Shares Outstanding
Balance at January 1, 2019	75,765,108	279,350,286
Shares issued for exercise of option rights		2,705,634
Shares tendered as payment for option rights exercised	11,514	(11,514)
Shares issued for vesting of restricted stock units		480,396
Shares tendered in connection with vesting of restricted stock units	165,285	(165,285)
Treasury stock purchased	5,025,000	(5,025,000)
Shares transferred from defined benefit pension plan (1)	900,000	(900,000)
Balance at December 31, 2019	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)
Shares 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

(1)    During the year ended December 31, 2019, 900,000 shares were transferred from the Company’s terminated domestic defined benefit pension plan surplus assets in connection with the plan’s termination as described in Note 7. In accordance with ASC 715, the transferred shares are treated as treasury stock. During the year ended December 31, 2020, the Company received proceeds of $182.4 million in conjunction with the issuance of 825,000 treasury shares to fund Company contributions to the domestic defined contribution plan.