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Equity (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Equity |
Summary of the status of the Company's unvested restricted stock units and changes during the year | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
Unvested RSUs | ​ | Shares | ​ | Per RSU
Unvested at January 1, 2021 | ​ | 995,720 | ​ | $ | 85.27
Granted(1) | ​ | 318,495 | ​ | ​ | 141.41
Vested | ​ | (7,812) | ​ | ​ | 86.52
Cancelled or forfeited | ​ | (19,107) | ​ | ​ | 89.99
Unvested at September 30, 2021 | ​ | 1,287,296 | ​ | $ | 99.08
Shares reserved for future grants (all plans) | ​ | 1,877,393 | ​ | ​ | ​
(1) | Comprised of 191,139 service-based RSUs and 127,356 performance-based RSUs granted in March 2021 with a fair value of $141.41 per RSU. The service-based RSUs cliff vest on December 1, 2023 and the performance-based RSUs are subject to a three-year performance period ending December 31, 2023.
Schedule of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Foreign Currency | ​ | Postretirement Benefit | ​ | Accumulated Other
​ | Translation | ​ | Plan Adjustments, | ​ | Comprehensive
​ | Loss |  | Net of Tax |  | Loss
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2021 | $ | (52.7) | ​ | $ | (25.2) | ​ | $ | (77.9)
Current-period change | ​ | (5.0) | ​ | ​ | — | ​ | ​ | (5.0)
Balance as of September 30, 2021 | $ | (57.7) | ​ | $ | (25.2) | ​ | $ | (82.9)

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