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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Property Plant And Equipment [Abstract]        
Depreciation expense $ 3.1 $ 3.6 $ 10.6 $ 11.3