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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Property Plant And Equipment [Abstract]    
Land   $ 2.3
Buildings and improvements   18.8
Leasehold improvements $ 30.8 31.0
Equipment 113.0 117.1
Gross property, plant and equipment 143.8 169.2
Less accumulated depreciation (107.3) (111.9)
Property, plant and equipment, net $ 36.5 $ 57.3