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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 12 Months Ended
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Dec. 31, 2023
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, 2023 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ |  | Non- |  | ​ | ​ |  | Accumulated |
​ | ​ | ​ | ​ | ​ | Post- | ​ | Qualified | ​ | ​ | ​ | ​ | Other |
​ | ​ | Pension | ​ | Retirement | ​ | Pension | ​ | ​ | ​ | ​ | Comprehensive |
(In millions) | ​ | Benefits | ​ | Benefits | ​ | Benefits | ​ | Other | ​ | Income (Loss) |
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 gain (loss) | ​ | ​ | 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) | ​
Amortization of prior service cost | ​ |  | — | ​ | ​ | (2.8) | ​ | ​ | — | ​ | ​ | — | ​ |  | (2.8) | ​
Amortization of net gain (loss) | ​ |  | 5.5 | ​ | ​ | (4.9) | ​ | ​ | (0.3) | ​ | ​ | — | ​ |  | 0.3 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.5) | ​ | ​ | (0.5) | ​
Other adjustments | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.7 | ​ |  | 1.7 | ​
Balance at December 31, 2023 | ​ | $ | (20.3) | ​ | $ | 11.0 | ​ | $ | (0.2) | ​ | $ | 1.3 | ​ | $ | (8.2) | ​
​ Other comprehensive income (loss) in the Consolidated Statements of Income and Comprehensive Income is shown net of tax benefit (expense) of $(1.2) million, $(9.3) million and $(8.1) million for the years ended December 2023, 2022 and 2021, 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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