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Capital Stock - Common Shares in Treasury and Common Shares Outstanding (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward] |  |  |
Balance (in shares) | 93,116,762 | 93,883,645 |
Balance (in shares) | 92,144,839 | 93,116,762 | 93,883,645
Shares in Treasury |  |  |
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward] |  |  |
Balance (in shares) | 25,255,036 | 23,676,733 | 23,577,411
Shares tendered as payment for option rights exercised (in shares) | 3,838 | 1,159 | 16,545
Shares tendered in connection with vesting of restricted stock units (in shares) | 55,095 | 52,144 | 82,777
Treasury stock purchased (in shares) | 1,675,000 | 1,525,000 |
Shares transferred from defined benefit pension plan (in shares) | 300,000 |  |
Balance (in shares) | 27,288,969 | 25,255,036 | 23,676,733
Shares Outstanding |  |  |
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward] |  |  |
Balance (in shares) | 93,116,762 | 93,883,645 | 93,013,031
Shares tendered as payment for option rights exercised (in shares) | (3,838) | (1,159) | (16,545)
Shares issued for exercise of option rights (in shares) | 901,878 | 661,599 | 969,936
Shares tendered in connection with vesting of restricted stock units (in shares) | (55,095) | (52,144) | (82,777)
Net shares issued for vesting of restricted stock units (in shares) | 160,132 | 149,821 |
Treasury stock purchased (in shares) | 1,675,000 | 1,525,000 |
Shares transferred from defined benefit pension plan (in shares) | 300,000 |  |
Balance (in shares) | 92,144,839 | 93,116,762 | 93,883,645

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