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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill. |
Schedule of changes in the carrying amount of goodwill | ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2019 | $ | 1,870.8
Acquisitions | ​ | 131.8
Purchase price allocation adjustments | ​ | (1.9)
Effect of foreign currency translation | ​ | 3.1
Balance at December 31, 2019 | ​ | 2,003.8
Acquisition | ​ | 6.9
Purchase price allocation adjustments | ​ | (77.2)
Effect of foreign currency translation | ​ | 1.7
Balance at December 31, 2020 | ​ | 1,935.2
Acquisitions | ​ | 172.0
Effect of foreign currency translation | ​ | 0.4
Balance at December 31, 2021 | $ | 2,107.6

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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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