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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Income        
Net Income, Basic $ 162.5 $ 32.8 $ 249.7 $ 36.6
Net Income, Diluted $ 162.5 $ 32.8 $ 249.7 $ 36.6
Weighted Average Common Shares        
Basic 43.5 43.1 43.4 43.0
Effect of Dilutive Securities (in shares) 0.3 0.2 0.4 0.3
Diluted (in shares) 43.8 43.3 43.8 43.3
Per Common Share Amount        
Net income, Basic (in dollars per share) $ 3.74 $ 0.76 $ 5.75 $ 0.85
Effect of Dilutive Securities (in dollars per shares) (0.03)   (0.05)  
Net income, Diluted (in dollars per share) $ 3.71 $ 0.76 $ 5.70 $ 0.85