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Equity (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
Equity |
Summary of the status of the Company's restricted stock units and changes during the quarter | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | RSU and PSU | ​ | Fair Value
​ | ​ | Aggregate Units | ​ | Per Unit
Unvested at January 1, 2024 | ​ | 437,239 | ​ | $ | 213.06
Granted(1) | ​ | 170,611 | ​ | ​ | 289.07
Vested | ​ | (5,194) | ​ | ​ | 208.03
Cancelled or forfeited | ​ | (27,238) | ​ | ​ | 226.17
Unvested at June 30, 2024 | ​ | 575,418 | ​ | $ | 235.02
Shares reserved for future grants (all plans) | ​ | 1,332,023 | ​ | ​ | ​
(1) | Comprised of 100,669 RSUs and 69,942 PSUs granted in February 2024. The RSUs cliff vest on December 1, 2026 and the PSUs vest upon the completion of a 3-year performance period ending December 31, 2026.
Schedule of share repurchase activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023
​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​ | ​ | ​ | ​ | Average Cost | ​ | ​ | ​
​ | ​ | Shares | ​ | Per Share | ​ | Amount | ​ | Shares | ​ | Per Share | ​ | Amount
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​ | ​ | ​ | ​ | (in millions)
First quarter | ​ | — | ​ | $ | — | ​ | $ | — | ​ | 160,224 | ​ | $ | 242.86 | ​ | $ | 38.9
Second quarter | ​ | 1,804,180 | ​ | ​ | 287.81 | ​ | ​ | 519.3 | ​ | 308,454 | ​ | ​ | 239.55 | ​ | ​ | 73.9
​ | ​ | 1,804,180 | ​ | $ | 287.81 | ​ | $ | 519.3 | ​ | 468,678 | ​ | $ | 240.68 | ​ | $ | 112.8
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-period change | ​ | (23.1) | ​ | ​ | (1.7) | ​ | ​ | (24.8)
Balance as of June 30, 2024 | $ | (98.8) | ​ | $ | (2.7) | ​ | $ | (101.5)

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