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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Jun. 30, 2017
Property Plant And Equipment [Abstract]    
Land $ 2.5 $ 2.3
Buildings and improvements 20.5 17.1
Leasehold improvements 22.7 22.1
Equipment 111.1 106.9
Gross property, plant and equipment 156.8 148.4
Less accumulated depreciation (108.6) (97.3)
Property, plant and equipment, net $ 48.2 $ 51.1