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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Property Plant And Equipment [Abstract]    
Land $ 2.2 $ 2.3
Buildings and improvements 18.2 18.8
Leasehold improvements 31.1 31.0
Equipment 115.5 117.1
Gross property, plant and equipment 167.0 169.2
Less accumulated depreciation (112.0) (111.9)
Property, plant and equipment, net $ 55.0 $ 57.3