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ACCUMULATED OTHER COMPREHENSIVE INCOME, NET (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME, NET |
Schedule of Accumulated Other Comprehensive Income, Net | The following represents the changes in accumulated other comprehensive income, net by component (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign Currency |  | Unrealized | ​ | ​ | ​ | Total Accumulated Other
​ | ​ | Translation |  | Investment | ​ | Post-Retirement | ​ | Comprehensive
​ |  | Adjustment |  | Gain/Loss |  | Benefits |  | Income, Net
Balance at December 31, 2019 | ​ | $ | 38.2 | ​ | $ | 0.2 | ​ | $ | (0.8) | ​ | $ | 37.6
Other comprehensive income (loss) | ​ |  | 36.5 | ​ | ​ | (0.3) | ​ |  | 1.2 | ​ |  | 37.4
Balance at December 31, 2020 | ​ | $ | 74.7 | ​ | $ | (0.1) | ​ | $ | 0.4 | ​ | $ | 75.0
Other comprehensive loss | ​ |  | (19.3) | ​ | ​ | — | ​ | ​ | (0.1) | ​ |  | (19.4)
Balance at December 31, 2021 | ​ | $ | 55.4 | ​ | $ | (0.1) | ​ | $ | 0.3 | ​ | $ | 55.6

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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