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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET (Tables) | 12 Months Ended
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Dec. 31, 2023
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET |
Schedule of accumulated other comprehensive income (loss), net | The following represents the changes in accumulated other comprehensive income (loss), net by component (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign Currency |  | Unrealized | ​ | ​ | ​ | Total Accumulated Other
​ | ​ | Translation |  | Investment | ​ | Post-Retirement | ​ | Comprehensive
​ |  | Adjustment |  | Gain/Loss |  | Benefits |  | Income (Loss), Net
Balance at December 31, 2021 | ​ | $ | 55.4 | ​ | $ | (0.1) | ​ | $ | 0.3 | ​ | $ | 55.6
Other comprehensive loss | ​ |  | (85.6) | ​ | ​ | (0.8) | ​ | ​ | (0.2) | ​ |  | (86.6)
Balance at December 31, 2022 | ​ | $ | (30.2) | ​ | $ | (0.9) | ​ | $ | 0.1 | ​ | $ | (31.0)
Other comprehensive income (loss) | ​ |  | 24.6 | ​ | ​ | (2.8) | ​ | ​ | (0.2) | ​ | ​ | 21.6
Balance at December 31, 2023 | ​ | $ | (5.6) | ​ | $ | (3.7) | ​ | $ | (0.1) | ​ | $ | (9.4)
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