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

Accounts and Other Receivables - Components of Accounts and Other Receivables (Detail)

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Accounts and Other Receivables - Components of Accounts and Other Receivables (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Trade receivables $ 128.5 $ 123.3  
Other receivables and advances 17.0 16.7  
Allowance for doubtful accounts (2.1) (2.3) (2.7)
Total accounts and other receivables $ 143.4 $ 137.7