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Equity (Tables) | 6 Months Ended
--- | ---
Jun. 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 | ​ | (5,977) | ​ | ​ | 85.38
Cancelled or forfeited | ​ | (12,529) | ​ | ​ | 87.42
Unvested at June 30, 2021 | ​ | 1,295,709 | ​ | $ | 99.05
Shares reserved for future grants (all plans) | ​ | 1,864,400 | ​ | ​ | ​
(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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Pension and | ​ | Accumulated
​ | Foreign Currency | ​ | Postretirement | ​ | Other
​ | Translation | ​ | Benefit Adjustments, | ​ | Comprehensive
​ | (Loss) Gain |  | Net of Tax |  | (Loss) Income
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2021 | $ | (52.7) | ​ | $ | (25.2) | ​ | $ | (77.9)
Current-period change | ​ | 3.3 | ​ | ​ | — | ​ | ​ | 3.3
Balance as of June 30, 2021 | $ | (49.4) | ​ | $ | (25.2) | ​ | $ | (74.6)

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