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, 2016
Mar. 31, 2015
Inventory Disclosure [Abstract]    
Finished goods $ 144.4 $ 150.6
Work-in-process 5.7 6.6
Raw materials and supplies 50.7 67.5
Provision for obsolete finished goods and raw materials (7.8) (6.7)
Total inventories $ 193.0 $ 218.0