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EARNINGS (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Basic and Diluted earnings per share numerator:            
Net income $ 167.8 $ 173.4 $ (184.5) $ 109.6 $ 341.2 $ (74.9)
Net income allocated to participating securities (0.8)       (1.6)  
Net income (loss) allocated to common stockholders $ 167.0   $ (184.5)   $ 339.6 $ (74.9)
Basic earnings per share denominator:            
Weighted average shares outstanding (in shares) 105.7   106.3   105.8 106.5
Basic earnings (loss) per share (in dollars per share) $ 1.58   $ (1.74)   $ 3.21 $ (0.70)
Diluted earnings per share denominator:            
Weighted average shares outstanding (in shares) 105.7   106.3   105.8 106.5
Dilutive common shares issued under stock program (in shares) 0.4       0.3  
Total dilutive weighted average shares (in shares) 106.1   106.3   106.1 106.5
Diluted earnings (loss) per share (in dollars per share) $ 1.57   $ (1.74)   $ 3.20 $ (0.70)
Anti-dilutive shares excluded from the computation of diluted loss per share (in shares)     0.1     0.2