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v3.20.4

Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
After-tax components of comprehensive income (loss) | The following table sets forth the after-tax components of accumulated other comprehensive (loss) income and changes thereto:
| Foreign Currency Translation Adjustment |  |  |  | Prior Service Credit (Cost) Associated with Postretirement Plans |  |  |  |  |  | Total Accumulated Other Comprehensive Income
| (Dollars in millions)
December 31, 2017 | $ | 1.4 |  |  |  |  | $ | — |  |  |  |  |  |  | $ | 1.4 |
Current period change | (5.9) |  |  |  |  | 44.6 |  |  |  |  |  |  | 38.7 |
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 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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