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, 2014
Mar. 31, 2013
Mar. 31, 2012
Receivables [Abstract]      
Trade receivables $ 135.5 $ 134.1  
Other receivables and advances 4.7 17.0  
Allowance for doubtful accounts (1.0) (2.1) (2.3)
Total accounts and other receivables $ 139.2 $ 149.0