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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 3 Months Ended
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Mar. 31, 2024
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 10. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended March 31, 2024 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2023 | ​ | $ | (20.3) | ​ | $ | 11.0 | ​ | $ | (0.2) | ​ | $ | 1.3 | ​ | $ | (8.2) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net gain (loss) | ​ | ​ | 0.1 | ​ | ​ | (0.2) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.9) | ​ | ​ | (0.9) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​
Balance at March 31, 2024 | ​ | $ | (20.2) | ​ | $ | 10.1 | ​ | $ | (0.2) | ​ | $ | 0.5 | ​ | $ | (9.8) | ​
​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended March 31, 2023 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2022 | ​ | $ | (25.8) | ​ | $ | 18.7 | ​ | $ | 0.1 | ​ | $ | 0.1 | ​ | $ | (6.9) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​
Amortization of net gain (loss) | ​ | ​ | 0.3 | ​ | ​ | (0.4) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.1) | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.3) | ​ | ​ | (0.3) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.7 | ​ | ​ | 1.7 | ​
Balance at March 31, 2023 | ​ | $ | (25.5) | ​ | $ | 17.6 | ​ | $ | 0.1 | ​ | $ | 1.5 | ​ | $ | (6.3) | ​
​

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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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