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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 12 Months Ended
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Dec. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 13.ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ​ Changes in accumulated other comprehensive income (loss) by component, net of tax, are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ |  | 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) | ​
​ Other comprehensive income (loss) in the Consolidated Statements of Income and Comprehensive Income is shown net of tax benefit (expense) of $4.2 million, $(0.3) million and $0.2 million for the years ended December 2020, 2019 and 2018, respectively.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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