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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Payables and Accruals [Abstract]    
Trade creditors $ 95.1us-gaap_AccountsPayableTradeCurrent $ 94.0us-gaap_AccountsPayableTradeCurrent
Accrued interest 5.8us-gaap_InterestPayableCurrent 0.5us-gaap_InterestPayableCurrent
Other creditors and accruals 48.7us-gaap_OtherAccruedLiabilitiesCurrent 47.5us-gaap_OtherAccruedLiabilitiesCurrent
Total accounts payable and accrued liabilities $ 149.6us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 142.0us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent