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Equity (Tables) | 9 Months Ended
--- | ---
Sep. 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 | ​ | (3,837) | ​ | ​ | 82.05
Cancelled or forfeited | ​ | (10,318) | ​ | ​ | 82.99
Unvested at September 30, 2019 | ​ | 1,364,020 | ​ | $ | 84.19
Shares reserved for future grants (all plans) | ​ | 1,037,999 | ​ | ​ | ​
(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 |  | Net of Tax |  | Loss
​ | (in millions)
Balance as of January 1, 2019 | $ | (76.8) | ​ | $ | (25.9) | ​ | $ | (102.7)
Current-period change | ​ | (0.7) | ​ | ​ | — | ​ | ​ | (0.7)
Balance as of September 30, 2019 | $ | (77.5) | ​ | $ | (25.9) | ​ | $ | (103.4)

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