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Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity |
Schedule of issued and outstanding common shares activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2022 |  | 2021 |  | 2020
​ | (in thousands)
Issued and outstanding common shares, beginning balances | ​ | 61,806 | ​ | ​ | 63,600 | ​ | ​ | 66,854
Issued to settle RSUs and PSUs, net of withheld shares | ​ | 506 | ​ | ​ | 313 | ​ | ​ | 414
Issued for stock option exercises | ​ | — | ​ | ​ | — | ​ | ​ | 6
Repurchased | ​ | (3,525) | ​ | ​ | (2,107) | ​ | ​ | (3,674)
Issued and outstanding common shares, ending balances | ​ | 58,787 | ​ | ​ | 61,806 | ​ | ​ | 63,600
​
Schedule of share repurchase activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​
​ | ​ | Shares | ​ | Per Share | ​ | Amount
​ | ​ | (in thousands) | ​ | ​ | ​ | ​ | (in millions)
2022 | ​ | 3,525 | ​ | $ | 178.81 | ​ | $ | 630.3
2021 | ​ | 2,107 | ​ | $ | 153.55 | ​ | $ | 323.5
2020 | ​ | 3,674 | ​ | $ | 91.80 | ​ | $ | 337.3
​
Schedule of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Pension and | ​ | ​
​ | Foreign Currency | ​ | Postretirement Benefit | ​ | Accumulated Other
​ | Translation | ​ | Plan Adjustments, | ​ | Comprehensive
​ | Loss |  | Net of Tax |  | Loss
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2022 | $ | (55.2) | ​ | $ | (13.7) | ​ | $ | (68.9)
Current-year change | ​ | (28.8) | ​ | ​ | 11.4 | ​ | ​ | (17.4)
Balance as of December 31, 2022 | $ | (84.0) | ​ | $ | (2.3) | ​ | $ | (86.3)
​

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