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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Earnings per share      
Income (loss) from continuing operations $ 57.2 $ 68.7  
Income (loss) from discontinued operations–net of tax (124.4) (21.1)  
Gain (loss) on disposition of discontinued operations – net of tax 0.6 2.7  
Net income (loss) $ (66.6) $ 50.3  
Basic shares:      
Weighted average shares outstanding - basic (in shares) 70.6 79.7  
Earnings (loss) per share – basic:      
Income (loss) from continuing operations $ 0.81 $ 0.86  
Income (loss) from discontinued operations – net of tax (1.76) (0.26)  
Gain (loss) on disposition of discontinued operations – net of tax 0.01 0.03  
Net income (loss) $ (0.94) $ 0.63  
Diluted shares:      
Weighted average shares outstanding - basic (in shares) 70.6 79.7  
Effect of dilutive securities:      
Stock options and restricted stock awards [in shares] 1.2 2.0  
Diluted weighted average shares outstanding (in shares) 71.8 81.7  
Earnings (loss) per share – diluted:      
Income (loss) from continuing operations $ 0.79 $ 0.84  
Income (loss) from discontinued operations–net of tax (1.73) (0.26)  
Gain (loss) on disposition of discontinued operations – net of tax 0.01 0.04  
Net income (loss) (0.93) $ 0.62  
Other details of antidilutive securities      
Common stock, par value (in dollars per share) $ 0.01   $ 0.01
Restricted Stock      
Other details of antidilutive securities      
Antidilutive securities excluded from computation of earnings per share (in shares) 0.8 0.1