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, 2013
Mar. 31, 2012
Inventory [Line Items]    
Finished goods $ 115.8 $ 117.9
Work-in-process 7.6 9.0
Raw materials and supplies 55.1 58.2
Provision for obsolete finished goods and raw materials (6.4) (5.3)
Total inventories $ 172.1 $ 179.8