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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Property Plant And Equipment [Abstract]    
Land $ 2.4 $ 2.3
Buildings and improvements 17.5 17.1
Leasehold improvements 22.1 22.1
Equipment 108.7 106.9
Gross property, plant and equipment 150.7 148.4
Less accumulated depreciation (100.9) (97.3)
Property, plant and equipment, net $ 49.8 $ 51.1