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Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2020
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 recorded during the six months ended June 30, 2020:
| Foreign Currency Translation Adjustment |  |  |  | Prior Service Credit (Cost) Associated with Postretirement Plans |  |  |  |  |  | Total Accumulated Other Comprehensive Income
| (Dollars in millions) |  |  |  |  |  |  |  |  |  |
December 31, 2019 | $ | (4.3) |  |  |  |  | $ | 35.9 |  |  |  |  |  |  | $ | 31.6 |
Reclassification from other comprehensive income to earnings | — |  |  |  |  | (4.4) |  |  |  |  |  |  | (4.4) |
Current period change | (0.7) |  |  |  |  | — |  |  |  |  |  |  | (0.7) |
June 30, 2020 | $ | (5.0) |  |  |  |  | $ | 31.5 |  |  |  |  |  |  | $ | 26.5 |

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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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