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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2019
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 nine months ended September 30, 2019:
| Foreign Currency Translation Adjustment |  | Prior Service Credit (Cost) 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 | — |  |  | (6.6 | ) |  | (6.6 | )
Current period change | (1.7 | ) |  | — |  |  | (1.7 | )
September 30, 2019 | $ | (6.2 | ) |  | $ | 38.0 |  |  | $ | 31.8 |

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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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