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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings per share        
Income (loss) from continuing operations $ 159.8 $ 74.1 $ 269.7 $ 126.4
Gain (loss) on disposition of discontinued operations – net of tax (0.4) 0.0 2.3 (0.4)
Net income (loss) $ 159.4 $ 74.1 $ 272.0 $ 126.0
Basic shares:        
Weighted average shares outstanding - basic (in shares) 67.6 68.9 67.7 69.3
Earnings (loss) per share – basic:        
Income (loss) from continuing operations $ 2.36 $ 1.08 $ 3.98 $ 1.82
Gain (loss) on disposition of discontinued operations – net of tax 0 0 0.04 0
Net income (loss) $ 2.36 $ 1.08 $ 4.02 $ 1.82
Diluted shares:        
Weighted average shares outstanding - basic (in shares) 67.6 68.9 67.7 69.3
Effect of dilutive securities:        
Stock options and restricted stock awards (in shares) 0.5 0.4 0.8 0.8
Diluted weighted average shares outstanding (in shares) 68.1 69.3 68.5 70.1
Earnings (loss) per share – diluted:        
Income (loss) from continuing operations $ 2.35 $ 1.07 $ 3.94 $ 1.80
Gain (loss) on disposition of discontinued operations – net of tax (0.01) 0 0.03 0
Net income (loss) $ 2.34 $ 1.07 $ 3.97 $ 1.80
Restricted Stock        
Earnings (loss) per share – diluted:        
Antidilutive securities excluded from computation of earnings per share (in shares) 0.5 0.9 0.3 0.6