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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Loss |
Schedule of amounts recognized in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ |  | Accumulated
​ | ​ | Foreign | ​ | ​ | ​ | ​ | ​ | ​ | Other
​ | ​ | Currency | ​ | Pension | ​ | ​ | Cash Flow | ​ | Comprehensive
​ |  | Translation |  | Adjustment |  | ​ | Hedges (1) |  | Loss
​ | ​ | (in millions)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance December 31, 2021 | ​ | $ | (127.9) | ​ | $ | — | ​ | $ | 0.6 | ​ | $ | (127.3)
Change in period | ​ |  | (29.1) | ​ |  | — | ​ |  | 6.5 | ​ |  | (22.6)
Balance December 31, 2022 | ​ | $ | (157.0) | ​ | $ | — | ​ | $ | 7.1 | ​ | $ | (149.9)
Change in period | ​ |  | 9.7 | ​ |  | 0.7 | ​ |  | (3.9) | ​ |  | 6.5
Balance December 31, 2023 | ​ | $ | (147.3) | ​ | $ | 0.7 | ​ | $ | 3.2 | ​ | $ | (143.4)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
(1) |  | Cash flow hedges include interest rate swaps and designated foreign currency hedges. See Note 17 for further details.
​

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