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Property, Plant and Equipment, Net - Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Abstract]      
Land $ 0.0 $ 0.0 $ 2.3
Buildings and improvements 0.0 0.0 18.8
Leasehold improvements 35.7 31.8 31.0
Equipment 117.9 112.1 117.1
Property, plant and equipment, gross 153.6 143.9 169.2
Less accumulated depreciation (112.9) (106.9) (111.9)
Property, plant and equipment, net $ 40.7 $ 37.0 $ 57.3