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STOCK PROGRAMS - Performance Share Units (Details) - Performance Share Units - Employee - $ / shares
shares in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award      
Vested (in shares)     0.5
Common Class A      
Share-based Compensation Arrangement by Share-based Payment Award      
Granted (in shares)   0.1  
Weighted-average grant date fair value (in dollars per share)   $ 218.11  
Common Stock issued (in shares) 0.2