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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Net [Abstract]    
Raw materials and manufacturing supplies $ 166.2 $ 147.3
Work in process 72.6 64.8
Finished goods 128.9 107.9
LIFO reserve (19.0) (17.9)
Total inventories $ 348.7 $ 302.1