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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
Payables and Accruals [Abstract]    
Trade creditors $ 108.4 $ 77.2
Accrued Interest 4.8 6.3
Other creditors and accruals 60.3 43.7
Total accounts payable and accrued liabilities $ 173.5 $ 127.2