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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | $ (89.0) |  |  |
Net current-period other comprehensive income (loss) | 4.3 | $ (2.8) |  |
Ending balance | (84.7) |  |  |
Actuarial Losses |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated Other Comprehensive Income (Loss) | (62.3) | (69.1) | $ (62.5) | $ (69.7)
Other comprehensive (loss) income before reclassifications | (0.3) | 0.1 |  |
Amounts reclassified from accumulated other comprehensive loss | 0.5 | 0.5 |  |
Net current-period other comprehensive income (loss) | 0.2 | 0.6 |  |
Prior Service Costs |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated Other Comprehensive Income (Loss) | (1.8) | (2.0) | (1.8) | (2.0)
Other comprehensive (loss) income before reclassifications | 0.0 | 0.0 |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 |  |
Net current-period other comprehensive income (loss) | 0.0 | 0.0 |  |
Currency Translation |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated Other Comprehensive Income (Loss) | (20.5) | (14.0) | (24.5) | (10.1)
Other comprehensive (loss) income before reclassifications | 4.0 | (3.9) |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 |  |
Net current-period other comprehensive income (loss) | 4.0 | (3.9) |  |
Interest Rate Swaps |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated Other Comprehensive Income (Loss) | (0.1) | 1.0 | (0.2) | 0.5
Other comprehensive (loss) income before reclassifications | 0.1 | 1.2 |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | (0.7) |  |
Net current-period other comprehensive income (loss) | 0.1 | 0.5 |  |
Accumulated Other Comprehensive Loss |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated Other Comprehensive Income (Loss) | (84.7) | (84.1) | $ (89.0) | $ (81.3)
Other comprehensive (loss) income before reclassifications | 3.8 | (2.6) |  |
Amounts reclassified from accumulated other comprehensive loss | 0.5 | (0.2) |  |
Net current-period other comprehensive income (loss) | $ 4.3 | $ (2.8) |  |

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