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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 6 Months Ended
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Jun. 30, 2024
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |
Schedule of changes in accumulated other comprehensive income (loss) by component, net of tax | Changes in accumulated other comprehensive income (loss) by component, net of tax, for the six months ended June 30, 2024 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2023 | ​ | $ | (20.3) | ​ | $ | 11.0 | ​ | $ | (0.2) | ​ | $ | 1.3 | ​ | $ | (8.2) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net gain (loss) | ​ | ​ | 0.1 | ​ | ​ | (0.2) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.9) | ​ | ​ | (0.9) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​
Balance at March 31, 2024 | ​ | ​ | (20.2) | ​ | ​ | 10.1 | ​ | ​ | (0.2) | ​ | ​ | 0.5 | ​ | ​ | (9.8) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net gain (loss) | ​ | ​ | 0.1 | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.3 | ​ | ​ | 0.3 | ​
Balance at June 30, 2024 | ​ | $ | (20.1) | ​ | $ | 9.3 | ​ | $ | (0.2) | ​ | $ | 0.8 | ​ | $ | (10.2) | ​
​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the six months ended June 30, 2023 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2022 | ​ | $ | (25.8) | ​ | $ | 18.7 | ​ | $ | 0.1 | ​ | $ | 0.1 | ​ | $ | (6.9) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net gain (loss) | ​ | ​ | 0.3 | ​ | ​ | (0.4) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.3) | ​ | ​ | (0.3) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.7 | ​ | ​ | 1.7 | ​
Balance at March 31, 2023 | ​ | ​ | (25.5) | ​ | ​ | 17.6 | ​ | ​ | 0.1 | ​ | ​ | 1.5 | ​ | ​ | (6.3) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net gain (loss) | ​ | ​ | 0.2 | ​ | ​ | (0.4) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | (0.7) | ​
Balance at June 30, 2023 | ​ | $ | (25.3) | ​ | $ | 16.5 | ​ | $ | 0.1 | ​ | $ | 0.8 | ​ | $ | (7.9) | ​
​

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