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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Schedule of changes in accumulated other comprehensive income (loss) by component, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ |  | Non- |  | ​ | ​ |  | Accumulated |
​ | ​ | ​ | ​ | ​ | Post- | ​ | Qualified | ​ | ​ | ​ | ​ | Other |
​ | ​ | Pension | ​ | Retirement | ​ | Pension | ​ | ​ | ​ | ​ | Comprehensive |
(In millions) | ​ | Benefits | ​ | Benefits | ​ | Benefits | ​ | Other | ​ | Income (Loss) |
Balance at December 31, 2019 | ​ | $ | (51.9) | ​ | $ | 16.3 | ​ | $ | (0.4) | ​ | $ | (0.9) | ​ | $ | (36.9) | ​
Amortization of prior service cost | ​ |  | (1.8) | ​ | ​ | (2.8) | ​ | ​ | (0.1) | ​ | ​ | — | ​ |  | (4.7) | ​
Amortization of net loss (gain) | ​ | ​ | (8.0) | ​ | ​ | (1.3) | ​ | ​ | (0.1) | ​ | ​ | — | ​ |  | (9.4) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.5 | ​ | ​ | 0.5 | ​
Other adjustments | ​ | ​ | — | ​ |  | — | ​ |  | — | ​ |  | (0.3) | ​ |  | (0.3) | ​
Balance at December 31, 2020 | ​ |  | (61.7) | ​ |  | 12.2 | ​ |  | (0.6) | ​ |  | (0.7) | ​ |  | (50.8) | ​
Amortization of prior service cost | ​ |  | (1.7) | ​ | ​ | (2.8) | ​ | ​ | (0.1) | ​ | ​ | — | ​ |  | (4.6) | ​
Amortization of net loss (gain) | ​ |  | 24.3 | ​ | ​ | 0.7 | ​ | ​ | — | ​ | ​ | — | ​ |  | 25.0 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.9) | ​ | ​ | (0.9) | ​
Other adjustments | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.4 | ​ |  | 0.4 | ​
Balance at December 31, 2021 | ​ | $ | (39.1) | ​ | $ | 10.1 | ​ | $ | (0.7) | ​ | $ | (1.2) | ​ | $ | (30.9) | ​
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