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, 2016
Mar. 31, 2015
Mar. 31, 2014
Receivables [Abstract]      
Trade receivables $ 169.6 $ 131.0  
Other receivables and advances 4.8 3.1  
Allowance for doubtful accounts (1.1) (0.8) $ (1.0)
Total accounts and other receivables $ 173.3 $ 133.3