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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (265.8) $ (231.8)
Unrealized losses on defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total (17.2) (15.7)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (283.0) $ (247.5)