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, 2017
Mar. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 146.7 $ 144.4
Work-in-process 6.5 5.7
Raw materials and supplies 57.5 50.7
Provision for obsolete finished goods and raw materials (7.8) (7.8)
Total inventories $ 202.9 $ 193.0