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COMMON STOCK - Schedule of Weighted-Average Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average risk-free interest rate 2.30% 2.90% 1.80%
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility 30.00% 29.00% 33.00%
Expected life 5 years 1 month 6 days 5 years 4 years 7 months 6 days
Fair value, per share (in dollars per share) $ 54.51 $ 42.51 $ 33.74
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average risk-free interest rate 2.40% 1.70% 0.80%
Expected dividend yield 0.00% 0.00% 0.00%
Expected volatility 32.00% 33.00% 33.00%
Expected life 7 months 6 days 7 months 6 days 7 months 6 days
Fair value, per share (in dollars per share) $ 49.29 $ 36.53 $ 25.69