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Goodwill | 12 Months Ended
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Dec. 31, 2023
Goodwill. |
Goodwill | Note 6. Goodwill ​ The changes in the carrying amount of goodwill are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ | ​ |  | (in millions)
Balance at January 1, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,107.6
Purchase price allocation adjustments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 5.3
Effect of foreign currency translation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (7.0)
Balance at December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2,105.9
Acquisition | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2.5
Effect of foreign currency translation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2.7
Balance at December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,111.1
​ We had no accumulated impairment losses related to goodwill at December 31, 2023 and 2022.

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