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Equity (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
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, 2019 | ​ | 889,830 | ​ | $ | 82.05
Granted(1) | ​ | 488,345 | ​ | ​ | 88.05
Vested | ​ | (713) | ​ | ​ | 81.29
Cancelled or forfeited | ​ | (6,052) | ​ | ​ | 82.52
Unvested at June 30, 2019 | ​ | 1,371,410 | ​ | $ | 84.18
Shares reserved for future grants (all plans) | ​ | 1,032,681 | ​ | ​ | ​
(1) | Comprised of 294,190 service-based RSUs and 194,155 performance-based RSUs granted in March 2019 with a fair value of $88.05 per RSU. The service-based RSUs cliff vest on December 1, 2021 and the performance-based RSUs are subject to a three-year performance period ending December 31, 2021.
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, 2019 | $ | (76.8) | ​ | $ | (25.9) | ​ | $ | (102.7)
Current-period change | ​ | 8.0 | ​ | ​ | — | ​ | ​ | 8.0
Balance as of June 30, 2019 | $ | (68.8) | ​ | $ | (25.9) | ​ | $ | (94.7)

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