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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Mar. 31, 2015
Payables and Accruals [Abstract]    
Trade creditors $ 77.2 $ 95.1
Accrued interest 6.3 5.8
Other creditors and accruals 43.7 48.7
Total accounts payable and accrued liabilities $ 127.2 $ 149.6