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Goodwill (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Goodwill. |
Schedule of changes in the carrying amount of goodwill | ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2021 | $ | 1,935.2
Foreign currency translation gain | ​ | 1.1
Balance at June 30, 2021 | $ | 1,936.3

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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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