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Stockholders' Equity - Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | $ (81.3) |  |
Net current-period other comprehensive income (loss) | (7.7) | $ 2.7 | $ (9.8)
Ending balance | (89.0) | (81.3) |
Actuarial Losses |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (69.7) | (68.6) |
Other comprehensive income (loss) before reclassifications | 2.2 | (2.8) |
Amounts reclassified from accumulated other comprehensive loss | 5.0 | 1.7 |
Net current-period other comprehensive income (loss) | 7.2 | (1.1) |
Ending balance | (62.5) | (69.7) | (68.6)
Prior Service Costs |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (2.0) | (2.0) |
Other comprehensive income (loss) before reclassifications | 0.1 | (0.1) |
Amounts reclassified from accumulated other comprehensive loss | 0.1 | 0.1 |
Net current-period other comprehensive income (loss) | 0.2 | 0.0 |
Ending balance | (1.8) | (2.0) | (2.0)
Foreign Currency Translation |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (10.1) | (16.0) |
Other comprehensive income (loss) before reclassifications | (14.4) | 5.9 |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 |
Net current-period other comprehensive income (loss) | (14.4) | 5.9 |
Ending balance | (24.5) | (10.1) | (16.0)
Interest Rate Swaps |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 0.5 | 2.6 |
Other comprehensive income (loss) before reclassifications | 1.1 | 0.3 |
Amounts reclassified from accumulated other comprehensive loss | (1.8) | (2.4) |
Net current-period other comprehensive income (loss) | (0.7) | (2.1) |
Ending balance | (0.2) | 0.5 | 2.6
Accumulated Other Comprehensive Loss |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (81.3) | (84.0) |
Other comprehensive income (loss) before reclassifications | (11.0) | 3.3 |
Amounts reclassified from accumulated other comprehensive loss | 3.3 | (0.6) |
Net current-period other comprehensive income (loss) | (7.7) | 2.7 | (9.8)
Ending balance | $ (89.0) | $ (81.3) | $ (84.0)

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