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Stockholders' Equity - AOCL (Details) - USD ($)
 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]        
Balance at beginning of period $ 411,800,000 $ 138,100,000 $ 323,400,000 $ (22,100,000)
Foreign currency translation adjustments 37,000,000.0 (31,500,000) 14,000,000.0 600,000
Balance at end of period 564,500,000 214,100,000 564,500,000 214,100,000
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (158,500,000) (143,200,000) (135,500,000) (175,300,000)
Foreign currency translation adjustments 37,000,000.0 (31,500,000) 14,000,000.0 600,000
Balance at end of period (121,500,000) (174,700,000) (121,500,000) (174,700,000)
Tax expense (benefits)     0 0
Net amount reclassified to earnings     0 0
Pensions        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (1,500,000) (1,600,000) (1,200,000) (1,600,000)
Net change from period revaluations 0 0 (300,000) 0
Balance at end of period $ (1,500,000) $ (1,600,000) (1,500,000) $ (1,600,000)
Tax expense (benefits)     $ 0