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Stockholders' Equity - AOCI (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ (22,100,000) | $ 285,800,000 | $ 504,600,000
Foreign currency translation adjustments | 39,800,000 | (80,100,000) | (36,600,000)
Total other comprehensive income | 400,000 | 2,400,000 | 2,900,000
Balance at end of period | 323,400,000 | (22,100,000) | 285,800,000
Foreign Currency Translation |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (175,300,000) | (95,200,000) | (58,600,000)
Foreign currency translation adjustments | 39,800,000 | (80,100,000) | (36,600,000)
Balance at end of period | (135,500,000) | (175,300,000) | (95,200,000)
Tax expense | 0 | 0 | 0
Net amount reclassified to earnings | 0 | 0 | 0
Pension Benefits |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (1,600,000) | (4,000,000.0) | (6,900,000)
Net change from period revaluation | 500,000 | 3,200,000 | 3,800,000
Tax expense | (100,000) | (800,000) | (900,000)
Balance at end of period | $ (1,200,000) | $ (1,600,000) | $ (4,000,000.0)

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