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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 12 Months Ended
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Dec. 31, 2022
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, consist of the following for the years ended December 31, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ |  | Non- |  | ​ | ​ |  | Accumulated |
​ | ​ | ​ | ​ | ​ | Post- | ​ | Qualified | ​ | ​ | ​ | ​ | Other |
​ | ​ | Pension | ​ | Retirement | ​ | Pension | ​ | ​ | ​ | ​ | Comprehensive |
(In millions) | ​ | Benefits | ​ | Benefits | ​ | Benefits | ​ | Other | ​ | Income (Loss) |
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) | ​
Amortization of prior service cost | ​ |  | (0.8) | ​ | ​ | (2.7) | ​ | ​ | — | ​ | ​ | — | ​ |  | (3.5) | ​
Amortization of net loss (gain) | ​ |  | 14.1 | ​ | ​ | 11.3 | ​ | ​ | 0.8 | ​ | ​ | 1.1 | ​ |  | 27.3 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.4) | ​ | ​ | (0.4) | ​
Other adjustments | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.6 | ​ |  | 0.6 | ​
Balance at December 31, 2022 | ​ | $ | (25.8) | ​ | $ | 18.7 | ​ | $ | 0.1 | ​ | $ | 0.1 | ​ | $ | (6.9) | ​
​ Other comprehensive income (loss) in the Consolidated Statements of Income and Comprehensive Income is shown net of tax benefit (expense) of $(9.3) million, $(8.1) million and $4.2 million for the years ended December 2022, 2021 and 2020, 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 https://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 https://asc.fasb.org/extlink&oid=126953954&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 https://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 https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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