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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance |  |  | $ (89.0) |  |  |  |  |
Net current-period other comprehensive income (loss) | $ (3.3) | $ 3.9 | 14.2 | $ (0.2) |  |  |  |
Ending balance | (74.8) |  | (74.8) |  |  |  |  |
Stockholders' Equity Attributable to Parent | 1,321.7 | 1,149.4 | 1,321.7 | 1,149.4 | $ 1,262.2 | $ 1,186.1 | $ 1,099.6 | $ 1,001.9
Actuarial Losses |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0.1 | (0.8) | (0.8) | (0.9) |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.5 | 0.6 | 1.6 | 1.6 |  |  |  |
Net current-period other comprehensive income (loss) | 0.6 | (0.2) | 0.8 | 0.7 |  |  |  |
Stockholders' Equity Attributable to Parent | (61.7) | (69.0) | (61.7) | (69.0) | (62.3) | (62.5) | (68.8) | (69.7)
Prior Service Costs |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0.1 | 0.0 | (0.1) | 0.0 |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 | 0.1 | 0.1 |  |  |  |
Net current-period other comprehensive income (loss) | 0.1 | 0.0 | 0.0 | 0.1 |  |  |  |
Stockholders' Equity Attributable to Parent | (1.8) | (1.9) | (1.8) | (1.9) | (1.9) | (1.8) | (1.9) | (2.0)
Currency Translation |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (4.0) | 5.6 | 13.2 | 0.3 |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Net current-period other comprehensive income (loss) | (4.0) | 5.6 | 13.2 | 0.3 |  |  |  |
Stockholders' Equity Attributable to Parent | (11.3) | (9.8) | (11.3) | (9.8) | (7.3) | (24.5) | (15.4) | (10.1)
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (3.8) | 3.7 | 12.4 | (0.1) |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.5 | 0.2 | 1.8 | (0.1) |  |  |  |
Net current-period other comprehensive income (loss) | (3.3) | 3.9 | 14.2 | (0.2) |  |  |  |
Stockholders' Equity Attributable to Parent | (74.8) | (81.5) | (74.8) | (81.5) | (71.5) | (89.0) | (85.4) | (81.3)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0.0 | (1.1) | 0.1 | 0.5 |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 0.0 | (0.4) | 0.1 | (1.8) |  |  |  |
Net current-period other comprehensive income (loss) | 0.0 | (1.5) | 0.2 | (1.3) |  |  |  |
Stockholders' Equity Attributable to Parent | $ 0.0 | $ (0.8) | $ 0.0 | $ (0.8) | $ 0.0 | $ (0.2) | $ 0.7 | $ 0.5

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