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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Schedule of changes in accumulated other comprehensive income (loss) by component, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2020 | ​ | $ | (61.7) | ​ | $ | 12.2 | ​ | $ | (0.6) | ​ | $ | (0.7) | ​ | $ | (50.8) | ​
Amortization of prior service cost | ​ | ​ | (0.4) | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1.1) | ​
Amortization of net loss | ​ | ​ | 0.9 | ​ | ​ | 0.2 | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | 1.2 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​ | ​ | (0.2) | ​
Balance at March 31, 2021 | ​ | $ | (61.2) | ​ | $ | 11.7 | ​ | $ | (0.5) | ​ | $ | (0.9) | ​ | $ | (50.9) | ​
​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended March 31, 2020 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2019 | ​ | $ | (51.9) | ​ | $ | 16.3 | ​ | $ | (0.4) | ​ | $ | (0.9) | ​ | $ | (36.9) | ​
Amortization of prior service cost | ​ | ​ | (0.5) | ​ | ​ | (0.6) | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | (1.2) | ​
Amortization of net loss | ​ | ​ | 1.1 | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | 1.3 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.5) | ​ | ​ | (0.5) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​ | ​ | (0.2) | ​
Balance at March 31, 2020 | ​ | $ | (51.3) | ​ | $ | 15.8 | ​ | $ | (0.4) | ​ | $ | (1.6) | ​ | $ | (37.5) | ​

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