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COMMON STOCK - Schedule of Stock Option (Details) - Stock option activity
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 17.1
Options granted (in shares) | shares 1.8
Options exercised (in shares) | shares (4.3)
Options forfeited (in shares) | shares (0.3)
Ending balance (in shares) | shares 14.3
Exercisable as of period end (in shares) | shares 9.5
Vested and expected to vest as of period end (in shares) | shares 13.6
Weighted- Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 32.19
Options granted (in dollars per share) | $ / shares 73.02
Options exercised (in dollars per share) | $ / shares 18.16
Options forfeited (in dollars per share) | $ / shares 49.74
Ending balance (in dollars per share) | $ / shares 41.27
Exercisable as of period end (in dollars per share) | $ / shares 32.32
Vested and expected to vest as of period end (in dollars per share) | $ / shares $ 40.37
Weighted- Average Remaining Contractual Term  
Outstanding as of period end 3 years 4 months 24 days
Exercisable as of period end 2 years 6 months
Vested and expected to vest as of period end 3 years 3 months 18 days
Aggregate Intrinsic Value  
Outstanding as of period end | $ $ 712.5
Exercisable as of period end | $ 558.1
Vested and expected to vest as of period end | $ $ 690.4