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Accumulated Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income The following table sets forth the after-tax components of accumulated other comprehensive income and changes thereto:
| Foreign Currency Translation Adjustment |  |  |  | Prior Service Credit Associated with Postretirement Plans |  |  |  |  |  | Total Accumulated Other Comprehensive Income
| (Dollars in millions)
December 31, 2018 | $ | (4.5) |  |  |  |  | $ | 44.6 |  |  |  |  |  |  | $ | 40.1 |
Reclassification from other comprehensive income to earnings | — |  |  |  |  | (8.7) |  |  |  |  |  |  | (8.7) |
Current period change | 0.2 |  |  |  |  | — |  |  |  |  |  |  | 0.2 |
December 31, 2019 | (4.3) |  |  |  |  | 35.9 |  |  |  |  |  |  | 31.6 |
Reclassification from other comprehensive income to earnings | — |  |  |  |  | (17.3) |  |  |  |  |  |  | (17.3) |
Current period change | 6.1 |  |  |  |  | 185.4 |  |  |  |  |  |  | 191.5 |
December 31, 2020 | 1.8 |  |  |  |  | 204.0 |  |  |  |  |  |  | 205.8 |
Reclassification from other comprehensive income to earnings | — |  |  |  |  | (46.4) |  |  |  |  |  |  | (46.4) |
Current period change | (1.0) |  |  |  |  | 139.5 |  |  |  |  |  |  | 138.5 |
December 31, 2021 | $ | 0.8 |  |  |  |  | $ | 297.1 |  |  |  |  |  |  | $ | 297.9 |
Postretirement health care and life insurance benefits reclassified from “Accumulated other comprehensive income” to earnings of $46.4 million, $17.3 million and $8.7 million during the years ended December 31, 2021, 2020 and 2019, respectively, are included in “Net periodic benefit (credit) costs, excluding service cost” in the accompanying consolidated statements of operations. Comprehensive income (loss) differed from net income (loss) by the amount of the change in prior service credit associated with postretirement plans (see Note 14. “Postretirement Health Care and Life Insurance Benefits” for information related to the Company’s postretirement plans) and foreign currency translation adjustment related to the Company’s investments in Middlemount, whose functional currency is the Australian dollar.

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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=123367319&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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