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SHARE-BASED AWARDS AND STOCK OPTIONS - Share-Based Awards (Details) - Restricted Stock Awards and Performance Units
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Shares  
Beginning balance (shares) | shares 1,546
Granted (shares) | shares 1,437
Vested (shares) | shares (1,162)
Forfeited (shares) | shares (90)
Ending balance (shares) | shares 1,731
Weighted-Average Grant-Date Fair Value  
Beginning balance (USD per share) | $ / shares $ 176.71
Granted (USD per share) | $ / shares 193.59
Vested (USD per share) | $ / shares 153.99
Forfeited (USD per share) | $ / shares 180.76
Ending balance (USD per share) | $ / shares $ 183.74