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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Jun. 30, 2016
Property Plant And Equipment [Abstract]    
Land $ 2.2 $ 2.3
Buildings and improvements 16.3 17.3
Leasehold improvements 22.0 18.7
Equipment 105.8 103.4
Gross property, plant and equipment 146.3 141.7
Less accumulated depreciation (93.3) (83.4)
Property, plant and equipment, net $ 53.0 $ 58.3