Quarterly report pursuant to Section 13 or 15(d)

Inventories - Summary of Inventories (Detail)

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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 31.1 $ 23.2
Work-in-process 84.5 73.5
Finished goods 120.3 111.4
Total inventories $ 235.9 $ 208.1