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ACCUMULATED OTHER COMPREHENSIVE INCOME, NET | 9 Months Ended
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Sep. 30, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME, NET |
ACCUMULATED OTHER COMPREHENSIVE INCOME, NET | 11. ACCUMULATED OTHER COMPREHENSIVE INCOME, NET The following represents the changes in accumulated other comprehensive income, net by component (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total Accumulated
​ | ​ | Currency |  | Unrealized | ​ | ​ | ​ | Other
​ | ​ | Translation |  | Investment | ​ | Post-Retirement | ​ | Comprehensive
​ |  | Adjustment |  | Gain (Loss) |  | Benefits |  | Income, Net
Balance at December 31, 2020 | ​ | $ | 74.7 | ​ | $ | (0.1) | ​ | $ | 0.4 | ​ | $ | 75.0
Other comprehensive loss | ​ |  | (8.9) | ​ | ​ | — | ​ | ​ | (0.1) | ​ | ​ | (9.0)
Balance at September 30, 2021 | ​ | $ | 65.8 | ​ | $ | (0.1) | ​ | $ | 0.3 | ​ | $ | 66.0
​

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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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