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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
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings per share        
Income (loss) from continuing operations $ 72.3 $ (3.2) $ 112.0 $ (27.9)
Income (loss) from discontinued operations – net of tax 0.0 (1.0) 0.0 (1.2)
Gain (loss) on disposition of discontinued operations – net of tax 1.6 (5.0) 2.0 (5.0)
Net income (loss) $ 73.9 $ (9.2) $ 114.0 $ (34.1)
Basic shares:        
Weighted average shares outstanding - basic (in shares) 69.8 69.3 69.7 69.9
Earnings (loss) per share – basic:        
Income (loss) from continuing operations $ 1.04 $ (0.05) $ 1.61 $ (0.40)
Income (loss) from discontinued operations – net of tax 0 (0.01) 0 (0.02)
Gain (loss) on disposition of discontinued operations – net of tax 0.02 (0.07) 0.03 (0.07)
Net income (loss) $ 1.06 $ (0.13) $ 1.64 $ (0.49)
Diluted shares:        
Weighted average shares outstanding - basic (in shares) 69.8 69.3 69.7 69.9
Effect of dilutive securities:        
Stock options and restricted stock awards (in shares) 1.1 0.0 1.2 0.0
Diluted weighted average shares outstanding (in shares) 70.9 69.3 70.9 69.9
Earnings (loss) per share – diluted:        
Income (loss) from continuing operations $ 1.02 $ (0.05) $ 1.58 $ (0.40)
Income (loss) from discontinued operations – net of tax 0 (0.01) 0 (0.02)
Gain (loss) on disposition of discontinued operations – net of tax 0.02 (0.07) 0.03 (0.07)
Net income (loss) $ 1.04 $ (0.13) $ 1.61 $ (0.49)
Restricted Stock        
Other details of antidilutive securities        
Antidilutive securities excluded from computation of earnings per share (in shares) 0.1 2.0 0.1 2.0