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, 2015
Mar. 31, 2014
Mar. 31, 2013
Receivables [Abstract]      
Trade receivables $ 131.0us-gaap_AccountsReceivableGrossCurrent $ 135.5us-gaap_AccountsReceivableGrossCurrent  
Other receivables and advances 3.1us-gaap_OtherReceivablesNetCurrent 4.7us-gaap_OtherReceivablesNetCurrent  
Allowance for doubtful accounts (0.8)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (1.0)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (2.1)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total accounts and other receivables $ 133.3us-gaap_AccountsAndOtherReceivablesNetCurrent $ 139.2us-gaap_AccountsAndOtherReceivablesNetCurrent