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Equity (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity |
Schedule of issued and outstanding common shares activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2024 |  | 2023 |  | 2022
​ | (in thousands)
Issued and outstanding common shares, beginning balance | ​ | 57,271 | ​ | ​ | 58,787 | ​ | ​ | 61,806
Issued to settle RSUs and PSUs, net of withheld shares | ​ | 309 | ​ | ​ | 362 | ​ | ​ | 506
Repurchased | ​ | (3,865) | ​ | ​ | (1,878) | ​ | ​ | (3,525)
Issued and outstanding common shares, ending balance | ​ | 53,715 | ​ | ​ | 57,271 | ​ | ​ | 58,787
Schedule of share repurchase activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​
​ | ​ | Shares |  | Per Share |  | Amount
​ | ​ | (in thousands) | ​ | ​ | ​ | ​ | (in millions)
2024 | ​ | 3,865 | ​ | $ | 282.98 | ​ | $ | 1,093.7
2023 | ​ | 1,878 | ​ | $ | 255.30 | ​ | $ | 479.5
2022 | ​ | 3,525 | ​ | $ | 178.81 | ​ | $ | 630.3
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, 2024 | $ | (75.7) | ​ | $ | (1.0) | ​ | $ | (76.7)
Current-year change | ​ | (44.0) | ​ | ​ | 5.5 | ​ | ​ | (38.5)
Balance as of December 31, 2024 | $ | (119.7) | ​ | $ | 4.5 | ​ | $ | (115.2)

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