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Goodwill | 3 Months Ended
--- | ---
Mar. 31, 2021
Goodwill. |
Goodwill | Note 4. Goodwill ​ The change in the carrying amount of goodwill is as follows: ​
​ | ​ | ​
​ | (in millions)
Balance at January 1, 2021 | $ | 1,935.2
Foreign currency translation gain | ​ | 0.5
Balance at March 31, 2021 | $ | 1,935.7
​ We had no accumulated impairment losses related to goodwill at March 31, 2021.

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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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