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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2025
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 in millions) | Foreign Currency Translation Adjustments |  | Pension and Other Postretirement Benefits(1) |  | Total
Balance as of December 31, 2024 | $ | (86.7) |  |  | $ | (8.6) |  |  | $ | (95.3) |
Other comprehensive income (loss) before reclassifications | 51.2 |  |  | — |  |  | 51.2 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 0.2 |  |  | 0.2 |
Other comprehensive income (loss) | 51.2 |  |  | 0.2 |  |  | 51.4 |
Balance as of June 30, 2025 | $ | (35.5) |  |  | $ | (8.4) |  |  | $ | (43.9) |
Balance as of December 31, 2023 | $ | (56.8) |  |  | $ | (9.6) |  |  | $ | (66.4) |
Other comprehensive income (loss) before reclassifications | (14.9) |  |  | — |  |  | (14.9) |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 0.2 |  |  | 0.2 |
Other comprehensive income (loss) | (14.9) |  |  | 0.2 |  |  | (14.7) |
Balance as of June 30, 2024 | $ | (71.7) |  |  | $ | (9.4) |  |  | $ | (81.1) |
(1) Net of taxes of $1.4 million and $1.5 million as of June 30, 2025 and December 31, 2024, respectively. Net of taxes of $1.7 million and $1.8 million as of June 30, 2024 and December 31, 2023, respectively.

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