Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Inventories - Components of Inventories (Detail)

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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 190.3 $ 146.7
Work-in-process 8.1 6.5
Raw materials and supplies 65.3 57.5
Provision for obsolete finished goods and raw materials (8.0) (7.8)
Total inventories $ 255.7 $ 202.9