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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Income        
Net Income, Basic $ 283.2 $ 70.9 $ 532.9 $ 107.5
Net Income, Diluted $ 283.2 $ 70.9 $ 532.9 $ 107.5
Weighted Average Common Shares        
Basic 42.9 43.1 43.3 43.0
Effect of Dilutive Securities (in shares) 0.5 0.4 0.4 0.4
Diluted (in shares) 43.4 43.5 43.7 43.4
Per Common Share Amount        
Net income, Basic (in dollars per share) $ 6.60 $ 1.65 $ 12.31 $ 2.50
Effect of Dilutive Securities (in dollars per shares) (0.07) (0.02) (0.12) (0.02)
Net income, Diluted (in dollars per share) $ 6.53 $ 1.63 $ 12.19 $ 2.48