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Goodwill (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Goodwill. |
Schedule of changes in the carrying amount of goodwill | ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2022 | $ | 2,107.6
Purchase price allocation adjustments | ​ | 4.5
Foreign currency translation gain | ​ | 0.9
Balance at March 31, 2022 | $ | 2,113.0

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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