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ACCUMULATED OTHER COMPREHENSIVE INCOME, NET (Tables) | 6 Months Ended
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Jun. 30, 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 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total Accumulated
​ | ​ | Currency |  | Unrealized | ​ | ​ | ​ | Other
​ | ​ | Translation |  | Investment | ​ | Post-Retirement | ​ | Comprehensive
​ |  | Adjustment |  | Gain (Loss) |  | Benefits |  | Income, Net
Balance at December 31, 2020 | ​ | $ | 74.7 | ​ | $ | (0.1) | ​ | $ | 0.4 | ​ | $ | 75.0
Other comprehensive income | ​ |  | 10.8 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10.8
Balance at June 30, 2021 | ​ | $ | 85.5 | ​ | $ | (0.1) | ​ | $ | 0.4 | ​ | $ | 85.8

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