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Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Equity |
Schedule of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Pension and | ​ | Accumulated
​ | Foreign Currency | ​ | Postretirement | ​ | Other
​ | Translation | ​ | Benefit Adjustments, | ​ | Comprehensive
​ | (Loss) Gain |  | Net of Tax |  | Loss
​ | (in millions)
Balance as of January 1, 2019 | $ | (76.8) | ​ | $ | (25.9) | ​ | $ | (102.7)
Current-year change | ​ | 12.4 | ​ | ​ | (14.8) | ​ | ​ | (2.4)
Balance as of December 31, 2019 | $ | (64.4) | ​ | $ | (40.7) | ​ | $ | (105.1)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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