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Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity |
Schedule of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Foreign Currency | ​ | Postretirement Benefit | ​ | Accumulated Other
​ | Translation | ​ | Plan Adjustments, | ​ | Comprehensive
​ | Loss |  | Net of Tax |  | (Loss) Income
​ | ​ | ​ | ​ | (in millions) | ​ | ​ | ​
Balance as of January 1, 2021 | $ | (52.7) | ​ | $ | (25.2) | ​ | $ | (77.9)
Current-year change | ​ | (2.5) | ​ | ​ | 11.5 | ​ | ​ | 9.0
Balance as of December 31, 2021 | $ | (55.2) | ​ | $ | (13.7) | ​ | $ | (68.9)

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