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COMMON STOCK - Schedule of Restricted Stock Unit Activity (Details) - Nonvested restricted stock unit activity
shares in Millions
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 2.7
Granted (in shares) | shares 0.9
Vested (in shares) | shares (0.9)
Forfeited (in shares) | shares (0.1)
Ending balance (in shares) | shares 2.6
Weighted- Average Grant-Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 46.89
Granted (in dollars per share) | $ / shares 71.31
Vested (in dollars per share) | $ / shares 40.03
Forfeited (in dollars per share) | $ / shares 49.90
Ending balance (in dollars per share) | $ / shares $ 57.59