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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (loss) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (288.7) $ (329.8)
Currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total (285.6) (327.9)
Unrealized losses on defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (3.1) $ (1.9)