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Goodwill (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2019
Goodwill. |
Schedule of changes in the carrying amount of goodwill | ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2019 | $ | 1,870.8
Acquisition | ​ | 1.0
Purchase price allocation adjustments | ​ | (0.5)
Foreign currency translation gain | ​ | 1.5
Balance at September 30, 2019 | $ | 1,872.8

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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=108376223&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=108376223&loc=d3e13854-109267 + Details
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