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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
After-tax components of comprehensive income (loss) | 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 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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