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Capital Stock - Common Shares in Treasury and Common Shares Outstanding (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward] |  |  |
Beginning balance outstanding (in shares) | 268,700,000 | 276,400,000 |
Shares sold (in shares) |  | 825,000 |
Ending balance outstanding (in shares) | 261,100,000 | 268,700,000 | 276,400,000
Proceeds from treasury stock issued | $ 11.7 | $ 182.4 |
Shares in Treasury |  |  |
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward] |  |  |
Beginning balance in treasury (in shares) | 1,138,692 | 81,866,907 | 75,765,108
Shares tendered as payment for option rights exercised (in shares) | 4,324 | 10,140 | 11,514
Shares tendered in connection with vesting of restricted stock units (in shares) | 95,618 | 133,077 | 165,285
Treasury stock purchased (in shares) | (10,075,000) | (11,700,000) | (5,025,000)
Shares transferred from defined benefit pension plan (in shares) |  |  | (900,000)
Treasury stock, retired (in shares) |  | (91,746,432) |
Shares sold (in shares) |  | 825,000 |
Ending balance in treasury (in shares) | 11,313,634 | 1,138,692 | 81,866,907
Shares Outstanding |  |  |
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward] |  |  |
Beginning balance outstanding (in shares) | 268,676,631 | 276,434,517 | 279,350,286
Shares issued for exercise of option rights (in shares) | 2,365,168 | 2,873,646 | 2,705,634
Shares tendered as payment for option rights exercised (in shares) | (4,324) | (10,140) | (11,514)
Shares issued for vesting of restricted stock units (in shares) | 276,948 | 386,685 | 480,396
Shares tendered in connection with vesting of restricted stock units (in shares) | (95,618) | (133,077) | (165,285)
Treasury stock purchased (in shares) | (10,075,000) | (11,700,000) | (5,025,000)
Shares transferred from defined benefit pension plan (in shares) |  |  | (900,000)
Shares sold (in shares) |  | 825,000 |
Ending balance outstanding (in shares) | 261,143,805 | 268,676,631 | 276,434,517

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