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ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Capitalized Software (Details) - Capitalized software development costs - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Line Items]    
Capitalized software development costs $ 111.2 $ 95.7
Additions related to capitalized software development costs $ 15.4 $ 14.3
Minimum    
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Maximum    
Property, Plant and Equipment [Line Items]    
Useful life 5 years