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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2024
Equity [Abstract] |
Schedule of Accumulated Balances Related to Each Component of Accumulated Other Comprehensive Income (Loss) | The changes in accumulated other comprehensive loss by component were as follows:
(Dollars and accompanying footnotes in millions) | Foreign Currency Translation Adjustments |  | Pension and Other Postretirement Benefits(1) |  | Total
Balance as of December 31, 2023 | $ | (56.8) |  |  | $ | (9.6) |  |  | $ | (66.4) |
Other comprehensive income (loss) before reclassifications | (9.2) |  |  | — |  |  | (9.2) |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 0.1 |  |  | 0.1 |
Net current-period other comprehensive income (loss) | (9.2) |  |  | 0.1 |  |  | (9.1) |
Balance as of March 31, 2024 | $ | (66.0) |  |  | $ | (9.5) |  |  | $ | (75.5) |
Balance as of December 31, 2022 | $ | (75.6) |  |  | $ | (9.6) |  |  | $ | (85.2) |
Other comprehensive income (loss) before reclassifications | 9.7 |  |  | — |  |  | 9.7 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | — |  |  | — |
Net current-period other comprehensive income (loss) | 9.7 |  |  | — |  |  | 9.7 |
Balance as of March 31, 2023 | $ | (65.9) |  |  | $ | (9.6) |  |  | $ | (75.5) |
(1) Net of taxes of $1.8 million for both March 31, 2024 and December 31, 2023. Net of taxes of $1.9 million for both March 31, 2023 and December 31, 2022.

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