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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings per share        
Income (loss) from continuing operations $ 119.2 $ 81.8 $ 388.8 $ 208.2
Gain (loss) on disposition of discontinued operations – net of tax 0.0 0.0 2.3 (0.4)
Net income (loss) $ 119.2 $ 81.8 $ 391.1 $ 207.8
Basic shares:        
Weighted average shares outstanding - basic (in shares) 67.4 67.8 67.6 68.8
Earnings (loss) per share – basic:        
Income (loss) from continuing operations (in dollars per share) $ 1.77 $ 1.21 $ 5.75 $ 3.03
Gain (loss) on disposition of discontinued operations - net of tax (in dollars per share) 0 0 0.04 (0.01)
Net income (loss) (in dollars per share) $ 1.77 $ 1.21 $ 5.79 $ 3.02
Diluted shares:        
Weighted average shares outstanding - basic (in shares) 67.4 67.8 67.6 68.8
Effect of dilutive securities:        
Restricted stock awards (in shares) 0.8 0.6 0.8 0.8
Diluted weighted average shares outstanding (in shares) 68.2 68.4 68.4 69.6
Earnings (loss) per share – diluted:        
Income (loss) from continuing operations (in dollars per share) $ 1.75 $ 1.20 $ 5.69 $ 2.99
Gain (loss) on disposition of discontinued operations - net of tax (in dollars per share) 0 0 0.03 0
Net income (loss) (in dollars per share) $ 1.75 $ 1.20 $ 5.72 $ 2.99
Restricted Stock        
Earnings (loss) per share – diluted:        
Antidilutive securities excluded from computation of earnings per share (in shares) 0.0 0.5 0.3 0.6