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Inventories - Classes of Inventory (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 67.8 $ 48.7
Work in process 6.2 6.6
Finished goods 347.8 380.9
Total $ 421.8 $ 436.2