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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 3 Months Ended
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Mar. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 8. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended March 31, 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2020 | ​ | $ | (61.7) | ​ | $ | 12.2 | ​ | $ | (0.6) | ​ | $ | (0.7) | ​ | $ | (50.8) | ​
Amortization of prior service cost | ​ | ​ | (0.4) | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1.1) | ​
Amortization of net loss | ​ | ​ | 0.9 | ​ | ​ | 0.2 | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | 1.2 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​ | ​ | (0.2) | ​
Balance at March 31, 2021 | ​ | $ | (61.2) | ​ | $ | 11.7 | ​ | $ | (0.5) | ​ | $ | (0.9) | ​ | $ | (50.9) | ​
​ Changes in accumulated other comprehensive income (loss) by component, net of tax, for the three months ended March 31, 2020 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | Post- | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | Pension | ​ | Retirement | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Benefits |  | Benefits |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2019 | ​ | $ | (51.9) | ​ | $ | 16.3 | ​ | $ | (0.4) | ​ | $ | (0.9) | ​ | $ | (36.9) | ​
Amortization of prior service cost | ​ | ​ | (0.5) | ​ | ​ | (0.6) | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | (1.2) | ​
Amortization of net loss | ​ | ​ | 1.1 | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | 1.3 | ​
Foreign currency exchange | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.5) | ​ | ​ | (0.5) | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​ | ​ | (0.2) | ​
Balance at March 31, 2020 | ​ | $ | (51.3) | ​ | $ | 15.8 | ​ | $ | (0.4) | ​ | $ | (1.6) | ​ | $ | (37.5) | ​
​

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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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