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Goodwill | 6 Months Ended
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Jun. 30, 2019
Goodwill. |
Goodwill | Note 4. Goodwill ​ The change in the carrying amount of goodwill is as follows: ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2019 | $ | 1,870.8
Acquisition | ​ | 1.0
Purchase price allocation adjustments | ​ | (0.5)
Foreign currency translation gain | ​ | 2.5
Balance at June 30, 2019 | $ | 1,873.8
​ We had no accumulated impairment losses related to goodwill at June 30, 2019.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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