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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2017 | ​ | $ | (40.6) | ​ | $ | 15.6 | ​ | $ | (0.3) | ​ | $ | 0.4 | ​ | $ | (24.9) | ​
Reclassification adjustment related to the Tax Act (1) | ​ | ​ | (9.2) | ​ | ​ | 3.4 | ​ | ​ | (0.2) | ​ | ​ | — | ​ | ​ | (6.0) | ​
Amortization of prior service cost | ​ |  | (1.7) | ​ | ​ | (2.9) | ​ | ​ | (0.1) | ​ | ​ | — | ​ |  | (4.7) | ​
Amortization of net loss (gain) | ​ | ​ | (4.3) | ​ | ​ | 5.6 | ​ | ​ | 0.5 | ​ | ​ | (0.7) | ​ |  | 1.1 | ​
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) | ​
(1) | Reclassification from accumulated other comprehensive income (loss) to retained earnings for the remeasurement tax effects resulting from applying the Tax Act in accordance with ASU 2018-02.
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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