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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (loss) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (265.9) $ (297.3)
Currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total (262.2) (292.8)
Unrealized losses on defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (3.7) $ (4.5)