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Accounts and Other Receivables - Components of Accounts and Other Receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Receivables [Abstract]        
Trade receivables $ 194.5 $ 169.6    
Other receivables and advances 5.9 4.8    
Provision for doubtful trade debts (0.9) (1.1) $ (0.8) $ (1.0)
Total accounts and other receivables $ 199.5 $ 173.3