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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Jun. 30, 2015
Property, Plant and Equipment [Abstract]    
Land $ 2.3 $ 2.3
Buildings and improvements 18.8 18.2
Leasehold improvements 18.7 18.5
Equipment 101.9 99.1
Gross property, plant and equipment 141.7 138.1
Less accumulated depreciation (81.7) (70.9)
Property, plant and equipment, net $ 60.0 $ 67.2