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Equity (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
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, 2020 | ​ | 859,005 | ​ | $ | 86.40
Granted(1) | ​ | 540,547 | ​ | ​ | 82.81
Vested | ​ | (721) | ​ | ​ | 84.54
Cancelled or forfeited | ​ | (3,964) | ​ | ​ | 85.79
Unvested at March 31, 2020 | ​ | 1,394,867 | ​ | $ | 85.01
Shares reserved for future grants (all plans) | ​ | 494,905 | ​ | ​ | ​
(1) | Comprised of 330,144 service-based RSUs and 210,403 performance-based RSUs granted in March 2020 with a fair value of $82.81 per RSU. The service-based RSUs cliff vest on December 1, 2022 and the performance-based RSUs are subject to a three-year performance period ending December 31, 2022.
Schedule of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Pension and | ​ | Accumulated
​ | Foreign Currency | ​ | Postretirement | ​ | Other
​ | Translation | ​ | Benefit Adjustments, | ​ | Comprehensive
​ | Loss |  | Net of Tax |  | Loss
​ | (in millions)
Balance as of January 1, 2020 | $ | (64.4) | ​ | $ | (40.7) | ​ | $ | (105.1)
Current-period change | ​ | (31.4) | ​ | ​ | — | ​ | ​ | (31.4)
Balance as of March 31, 2020 | $ | (95.8) | ​ | $ | (40.7) | ​ | $ | (136.5)

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