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Property, Plant and Equipment, Net - Schedule of Depreciation Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 3.5 $ 3.3 $ 10.6 $ 8.8