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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2025
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 nine months ended September 30, 2025 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2024 | ​ | $ | (14.0) | ​ | $ | 8.1 | ​ | $ | (0.4) | ​ | $ | (0.2) | ​ | $ | (6.5) | ​
Amortization of prior service credit | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net actuarial loss | ​ | ​ | — | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.3 | ​ | ​ | 0.3 | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.2 | ​ | ​ | 0.2 | ​
Balance at March 31, 2025 | ​ | ​ | (14.0) | ​ | ​ | 7.3 | ​ | ​ | (0.4) | ​ | ​ | 0.3 | ​ | ​ | (6.8) | ​
Amortization of prior service credit | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net actuarial loss | ​ | ​ | — | ​ | ​ | (0.2) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.4 | ​ | ​ | 1.4 | ​
Balance at June 30, 2025 | ​ | ​ | (14.0) | ​ | ​ | 6.4 | ​ | ​ | (0.4) | ​ | ​ | 1.7 | ​ | ​ | (6.3) | ​
Amortization of prior service credit | ​ | ​ | — | ​ | ​ | (0.6) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.6) | ​
Amortization of net actuarial loss | ​ | ​ | — | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1.3) | ​ | ​ | (1.3) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.3) | ​ | ​ | (0.3) | ​
Balance at September 30, 2025 | ​ | $ | (14.0) | ​ | $ | 5.7 | ​ | $ | (0.4) | ​ | $ | 0.1 | ​ | $ | (8.6) | ​
​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the nine months ended September 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 credit | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net actuarial 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 credit | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net actuarial 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) | ​
Amortization of prior service credit | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net actuarial loss | ​ | ​ | — | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.0 | ​ | ​ | 1.0 | ​
Balance at September 30, 2024 | ​ | $ | (20.1) | ​ | $ | 8.5 | ​ | $ | (0.2) | ​ | $ | 1.8 | ​ | $ | (10.0) | ​
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