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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss). |
Schedule of the changes in accumulated other comprehensive income/(loss) by component and the reclassifications out of accumulated other comprehensive income/(loss) attributable to the entity's common stockholders | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated |
​ | ​ | Foreign | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Other |
​ | ​ | Currency | ​ | Interest Rate | ​ | ​ | ​ | ​ | Comprehensive |
​ | ​ | Translation | ​ | Swaps | ​ | Other | ​ | Income (Loss) |
Balance at January 1, 2018 | ​ | $ | (134.0) | ​ | $ | — | ​ | $ | (12.5) | ​ | $ | (146.5) | ​
Other comprehensive income before reclassifications | ​ |  | (74.3) | ​ | ​ | — | ​ | ​ | (13.7) | ​ |  | (88.0) | ​
Amounts reclassified from accumulated other comprehensive income — net of tax provision of $0.0 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Net current-period other comprehensive income | ​ |  | (74.3) | ​ |  | — | ​ |  | (13.7) | ​ |  | (88.0) | ​
Balance at December 31, 2018 | ​ | $ | (208.3) | ​ | $ | — | ​ | $ | (26.2) | ​ | $ | (234.5) | ​
Other comprehensive income before reclassifications | ​ |  | 22.2 | ​ | ​ | — | ​ | ​ | 9.5 | ​ |  | 31.7 | ​
Amounts reclassified from accumulated other comprehensive income — net of tax provision $0.0 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Net current-period other comprehensive income | ​ |  | 22.2 | ​ |  | — | ​ |  | 9.5 | ​ |  | 31.7 | ​
Balance at December 31, 2019 | ​ | $ | (186.1) | ​ | $ | — | ​ | $ | (16.7) | ​ | $ | (202.8) | ​
Other comprehensive income before reclassifications | ​ |  | 50.6 | ​ | ​ | (3.6) | ​ | ​ | (5.2) | ​ |  | 41.8 | ​
Amounts reclassified from accumulated other comprehensive income — net of tax provision of $0.0 | ​ |  | — | ​ |  | 0.4 | ​ |  | — | ​ |  | 0.4 | ​
Net current-period other comprehensive income | ​ |  | 50.6 | ​ |  | (3.2) | ​ |  | (5.2) | ​ |  | 42.2 | ​
Balance at December 31, 2020 | ​ | $ | (135.5) | ​ | $ | (3.2) | ​ | $ | (21.9) | ​ | $ | (160.6) | ​

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