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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ (81.3) |
Net current-period other comprehensive income (loss) | (2.8) | $ 0.6
Ending balance | (84.1) |
Actuarial Losses |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (69.7) | (68.6)
Other comprehensive income (loss) before reclassifications | 0.1 | (0.4)
Amounts reclassified from accumulated other comprehensive loss | 0.5 | 0.4
Net current-period other comprehensive income (loss) | 0.6 | 0.0
Ending balance | (69.1) | (68.6)
Prior Service Costs |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (2.0) | (2.0)
Other comprehensive income (loss) 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
Ending balance | (2.0) | (2.0)
Currency Translation |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (10.1) | (16.0)
Other comprehensive income (loss) before reclassifications | (3.9) | 1.5
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0
Net current-period other comprehensive income (loss) | (3.9) | 1.5
Ending balance | (14.0) | (14.5)
Interest Rate Swaps |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.5 | 2.6
Other comprehensive income (loss) before reclassifications | 1.2 | (0.4)
Amounts reclassified from accumulated other comprehensive loss | (0.7) | (0.5)
Net current-period other comprehensive income (loss) | 0.5 | (0.9)
Ending balance | 1.0 | 1.7
Accumulated Other Comprehensive Loss |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (81.3) | (84.0)
Other comprehensive income (loss) before reclassifications | (2.6) | 0.7
Amounts reclassified from accumulated other comprehensive loss | (0.2) | (0.1)
Net current-period other comprehensive income (loss) | (2.8) | 0.6
Ending balance | $ (84.1) | $ (83.4)

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