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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic:                      
Net income $ 309.5 $ 325.2 $ (121.9) $ 310.6 $ 280.2 $ 274.7 $ 242.3 $ 249.7 $ 823.4 $ 1,046.9 $ 722.2
Weighted-average shares outstanding (in shares)                 622.6 624.8 627.6
Basic earnings per share (in dollars per share) $ 0.50 $ 0.52 $ (0.20) $ 0.50 $ 0.45 $ 0.44 $ 0.39 $ 0.40 $ 1.32 $ 1.68 $ 1.15
Diluted:                      
Net income $ 309.5 $ 325.2 $ (121.9) $ 310.6 $ 280.2 $ 274.7 $ 242.3 $ 249.7 $ 823.4 $ 1,046.9 $ 722.2
Weighted-average shares outstanding (in shares)                 622.6 624.8 627.6
Dilutive effect of stock plans (in shares)                 9.3 11.9 13.3
Dilutive weighted-average shares outstanding (in shares)                 631.9 636.7 640.9
Diluted earnings per share (in dollars per share) $ 0.49 $ 0.52 $ (0.20) $ 0.49 $ 0.44 $ 0.43 $ 0.38 $ 0.39 $ 1.30 $ 1.64 $ 1.13