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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 365.9 $ 321.3
Work-in-process 84.9 76.7
Finished goods 99.6 103.4
Inventories $ 550.4 $ 501.4