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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
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic and Diluted EPS Numerator:            
Net income $ 105.5 $ 137.2 $ 113.6 $ 157.4 $ 242.7 $ 271.0
Earnings allocated to participating securities (0.3)   (0.3)   (0.7) (0.7)
Net income allocated to common stockholders $ 105.2   $ 113.3   $ 242.0 $ 270.3
Basic EPS Denominator:            
Weighted average shares outstanding (in shares) 106.8   109.5   107.1 109.9
Basic Net Income Per Common Share (in dollars per share) $ 0.99   $ 1.04   $ 2.26 $ 2.46
Diluted EPS Denominator:            
Weighted average shares outstanding (in shares) 106.8   109.5   107.1 109.9
Dilutive common shares issued under stock program (in shares) 0.1   0.1   0.2 0.2
Total dilutive weighted average shares (in shares) 106.9   109.6   107.3 110.1
Diluted earnings per share (in dollars per share) $ 0.98   $ 1.03   $ 2.26 $ 2.45