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COMMON STOCK - Additional Information (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of stock options exercised and restricted stock units vested $ 382.1 $ 281.1 $ 205.2
Cash from exercises of stock options 110.4 103.7 77.6
Realized tax benefits from exercises of stock options and vesting of restricted stock units 85.1 62.5 66.9
Total grant date fair value of stock options vested 31.2 $ 29.0 $ 26.3
Employee stock purchase subscriptions $ 126.3    
Weighted-average remaining requisite service period 30 months    
MRSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average risk-free interest rate 2.20% 2.70% 1.70%
Expected volatility 29.40% 29.70% 30.20%