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Goodwill | 12 Months Ended
--- | ---
Dec. 31, 2022
Goodwill. |
Goodwill | Note 6. Goodwill ​ The changes in the carrying amount of goodwill are as follows: ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2021 | $ | 1,935.2
Acquisitions | ​ | 172.0
Effect of foreign currency translation | ​ | 0.4
Balance at December 31, 2021 | ​ | 2,107.6
Purchase price allocation adjustments | ​ | 5.3
Effect of foreign currency translation | ​ | (7.0)
Balance at December 31, 2022 | $ | 2,105.9
​ We had no accumulated impairment losses related to goodwill at December 31, 2022 and 2021.

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