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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2018 | ​ | $ | (55.8) | ​ | $ | 21.7 | ​ | $ | (0.1) | ​ | $ | (0.3) | ​ | $ | (34.5) | ​
Amortization of prior service cost | ​ |  | (1.7) | ​ | ​ | (2.6) | ​ | ​ | (0.1) | ​ | ​ | (0.1) | ​ |  | (4.5) | ​
Amortization of net loss (gain) | ​ | ​ | 5.6 | ​ | ​ | (2.8) | ​ | ​ | (0.2) | ​ | ​ | 0.1 | ​ |  | 2.7 | ​
Other adjustments | ​ | ​ | — | ​ |  | — | ​ |  | — | ​ |  | (0.6) | ​ |  | (0.6) | ​
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) | ​
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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