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STOCK PROGRAMS - Performance Share Units (Details) - Performance Share Units - Employee - $ / shares
shares in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Jan. 31, 2020
Sep. 30, 2019
Mar. 31, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award          
Vested (in shares)         0.3
Common Class A          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted (in shares) 0.1 0.1   0.1  
Weighted-average grant date fair value (in dollars per share) $ 162.15 $ 162.15   $ 199.18  
Common Stock issued (in shares)     0.4