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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ (81.3) |
Net current-period other comprehensive income (loss) | $ 3.9 | $ (4.1) | (0.2) | $ 0.2
Ending balance | (81.5) |  | (81.5) |
Actuarial Losses |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (68.8) | (68.7) | (69.7) | (68.6)
Other comprehensive (loss) income before reclassifications | (0.8) | 0.3 | (0.9) | (0.6)
Amounts reclassified from accumulated other comprehensive loss | 0.6 | 0.5 | 1.6 | 1.3
Net current-period other comprehensive income (loss) | (0.2) | 0.8 | 0.7 | 0.7
Ending balance | (69.0) | (67.9) | (69.0) | (67.9)
Prior Service Costs |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1.9) | (2.0) | (2.0) | (2.0)
Other comprehensive (loss) income before reclassifications | 0.0 | 0.0 | 0.0 | 0.0
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.1 | 0.1 | 0.1
Net current-period other comprehensive income (loss) | 0.0 | 0.1 | 0.1 | 0.1
Ending balance | (1.9) | (1.9) | (1.9) | (1.9)
Currency Translation |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (15.4) | (11.3) | (10.1) | (16.0)
Other comprehensive (loss) income before reclassifications | 5.6 | (5.1) | 0.3 | (0.4)
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0
Net current-period other comprehensive income (loss) | 5.6 | (5.1) | 0.3 | (0.4)
Ending balance | (9.8) | (16.4) | (9.8) | (16.4)
Interest Rate Swaps |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0.7 | 2.3 | 0.5 | 2.6
Other comprehensive (loss) income before reclassifications | (1.1) | 0.8 | 0.5 | 1.5
Amounts reclassified from accumulated other comprehensive loss | (0.4) | (0.7) | (1.8) | (1.7)
Net current-period other comprehensive income (loss) | (1.5) | 0.1 | (1.3) | (0.2)
Ending balance | (0.8) | 2.4 | (0.8) | 2.4
Accumulated Other Comprehensive Loss |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (85.4) | (79.7) | (81.3) | (84.0)
Other comprehensive (loss) income before reclassifications | 3.7 | (4.0) | (0.1) | 0.5
Amounts reclassified from accumulated other comprehensive loss | 0.2 | (0.1) | (0.1) | (0.3)
Net current-period other comprehensive income (loss) | 3.9 | (4.1) | (0.2) | 0.2
Ending balance | $ (81.5) | $ (83.8) | $ (81.5) | $ (83.8)

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