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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (360.8) $ (247.5)
Currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total (341.1) (231.8)
Unrealized losses on defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (19.7) $ (15.7)