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STOCK-BASED COMPENSATION - Restricted Shares and Stock Units (Details)
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Weighted-average fair value  
Weighted-average fair value of nonvested restricted shares and restricted stock units, beginning balance (in dollars per share) | $ / shares $ 116.51
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) | $ / shares 180.72
Weighted-average fair value of restricted shares and restricted stock units nonvested dividend equivalents granted to non-employee directors (in dollars per share) | $ / shares 184.61
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) | $ / shares 100.40
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) | $ / shares 114.34
Weighted-average fair value of nonvested restricted shares and restricted stock units, ending balance (in dollars per share) | $ / shares $ 117.01
Restricted shares  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested, beginning balance (in shares) 7,412
Grants (in shares) 4,336
Nonvested dividend equivalents granted to non-employee directors (in shares) 0
Vested (in shares) (7,412)
Forfeited (in shares) 0
Nonvested, ending balance (in shares) 4,336
Restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested, beginning balance (in shares) 6,367,059
Grants (in shares) 18,356
Nonvested dividend equivalents granted to non-employee directors (in shares) 1,067
Vested (in shares) (88,268)
Forfeited (in shares) (42,792)
Nonvested, ending balance (in shares) 6,255,422
Restricted stock units | Performance-based  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested, ending balance (in shares) 361,609
Weighted-average fair value  
Nonvested shares where performance threshold has been met (in shares) 198,205