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
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Receivables [Abstract]        
Trade receivables $ 196.9 $ 194.5    
Other receivables and advances 7.1 5.9    
Provision for doubtful trade debts (1.3) (0.9) $ (1.1) $ (0.8)
Total accounts and other receivables $ 202.7 $ 199.5