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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Loss |
Schedule of amounts recognized in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | Accumulated
​ | ​ | Foreign | ​ | ​ | ​ | ​ | Other
​ | ​ | Currency | ​ | ​ | Cash Flow | ​ | Comprehensive
​ |  | Translation |  | ​ | Hedges (1) |  | Loss
​ | ​ | (in millions)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance December 31, 2019 | ​ | $ | (131.3) | ​ | $ | 0.5 | ​ | $ | (130.8)
Change in period | ​ |  | 31.4 | ​ |  | (0.6) | ​ |  | 30.8
Balance December 31, 2020 | ​ | $ | (99.9) | ​ | $ | (0.1) | ​ | $ | (100.0)
Change in period | ​ |  | (28.0) | ​ |  | 0.7 | ​ |  | (27.3)
Balance December 31, 2021 | ​ | $ | (127.9) | ​ | $ | 0.6 | ​ | $ | (127.3)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​
(1) |  | Cash flow hedges include interest rate swaps and designated foreign currency hedges. See Note 16 for further details.

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