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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Earnings per share          
Income (loss) from continuing operations $ 55.9 $ 95.4 $ 103.5 $ 35.1  
Gain (loss) on disposition of discontinued operations – net of tax 1.9 5.4 4.6 61.1  
Net income (loss) $ 57.8 $ 100.8 $ 108.1 $ 96.2  
Basic shares:          
Weighted average shares outstanding - basic (in shares) 75,500,000 95,700,000 77,600,000 100,400,000  
Earnings (loss) per share – basic:          
Income (loss) from continuing operations $ 0.74 $ 0.99 $ 1.33 $ 0.35  
Gain (loss) on disposition of discontinued operations – net of tax 0.03 0.06 0.06 0.61  
Net income (loss) $ 0.77 $ 1.05 $ 1.39 $ 0.96  
Diluted shares:          
Weighted average shares outstanding - basic (in shares) 75,500,000 95,700,000 77,600,000 100,400,000  
Effect of dilutive securities:          
Stock options and restricted stock awards [in shares] 1,200,000 1,400,000 1,700,000 1,800,000  
Diluted weighted average shares outstanding (in shares) 76,700,000 97,100,000 79,300,000 102,200,000  
Earnings (loss) per share – diluted:          
Income (loss) from continuing operations $ 0.73 $ 0.98 $ 1.30 $ 0.34  
Gain (loss) on disposition of discontinued operations – net of tax 0.02 0.06 0.06 0.60  
Net income (loss) 0.75 1.04 1.36 0.94  
Other details of antidilutive securities          
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01
Stock Options          
Other details of antidilutive securities          
Antidilutive securities excluded from computation of earnings per share (in shares) 0 8,000   8,000  
Restricted Stock          
Other details of antidilutive securities          
Antidilutive securities excluded from computation of earnings per share (in shares) 99,000 47,000 29,000 90,000