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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings per share        
Income (loss) from continuing operations $ 140.7 $ 159.8 $ 249.2 $ 269.7
Gain (loss) on disposition of discontinued operations – net of tax 0.0 (0.4) 0.0 2.3
Net income (loss) $ 140.7 $ 159.4 $ 249.2 $ 272.0
Basic shares:        
Weighted average shares outstanding - basic (in shares) 67.2 67.6 67.1 67.7
Earnings (loss) per share – basic:        
Income (loss) from continuing operations (in dollars per share) $ 2.09 $ 2.36 $ 3.71 $ 3.98
Gain (loss) on disposition of discontinued operations - net of tax (in dollars per share) 0 0 0 0.04
Net income (loss) (in dollars per share) $ 2.09 $ 2.36 $ 3.71 $ 4.02
Diluted shares:        
Weighted average shares outstanding - basic (in shares) 67.2 67.6 67.1 67.7
Effect of dilutive securities:        
Restricted stock (in shares) 0.5 0.5 0.7 0.8
Diluted weighted average shares outstanding (in shares) 67.7 68.1 67.8 68.5
Earnings (loss) per share – diluted:        
Income (loss) from continuing operations (in dollars per share) $ 2.08 $ 2.35 $ 3.68 $ 3.94
Gain (loss) on disposition of discontinued operations - net of tax (in dollars per share) 0 (0.01) 0 0.03
Net income (loss) (in dollars per share) $ 2.08 $ 2.34 $ 3.68 $ 3.97
Restricted Stock        
Earnings (loss) per share – diluted:        
Antidilutive securities excluded from computation of earnings per share (in shares) 0.1 0.5 0.1 0.3