Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail)

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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Cash and Cash Equivalents [Abstract]        
Cash at bank and on hand $ 94.5 $ 60.0 $ 70.9  
Short-term deposits 12.6 7.0 96.6  
Total cash and cash equivalents $ 107.1 $ 67.0 $ 167.5 $ 153.7