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NET INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic    
Net income $ 409.6 $ 321.7
Average shares outstanding (in shares) 265,800,000 273,200,000
Basic net income per share (in dollars per share) $ 1.54 $ 1.18
Diluted    
Net income $ 409.6 $ 321.7
Average shares outstanding assuming dilution:    
Average shares outstanding (in shares) 265,800,000 273,200,000
Stock options and other contingently issuable shares (in shares) 4,800,000 5,300,000
Non-vested restricted stock grants (in shares) 0 100,000
Average shares outstanding assuming dilution (in shares) 270,600,000 278,600,000
Diluted net income per share (in dollars per share) $ 1.51 $ 1.15
Stock options and other contingently issuable shares with anti-dilutive effects (in shares) 0 1,400,000