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, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 150.6us-gaap_InventoryFinishedGoods $ 132.7us-gaap_InventoryFinishedGoods
Work-in-process 6.6us-gaap_InventoryWorkInProcess 6.1us-gaap_InventoryWorkInProcess
Raw materials and supplies 67.5us-gaap_InventoryRawMaterialsAndSupplies 55.0us-gaap_InventoryRawMaterialsAndSupplies
Provision for obsolete finished goods and raw materials (6.7)us-gaap_InventoryValuationReserves (7.3)us-gaap_InventoryValuationReserves
Total inventories $ 218.0us-gaap_InventoryNet $ 186.5us-gaap_InventoryNet