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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Earnings per share          
Income (loss) from continuing operations $ 38.4 $ 56.6 $ 141.9 $ 91.7  
Gain (loss) on disposition of discontinued operations – net of tax 0.2 2.6 4.8 63.7  
Net income (loss) $ 38.6 $ 59.2 $ 146.7 $ 155.4  
Basic shares:          
Weighted average shares outstanding - basic (in shares) 73.7 88.0 76.3 96.2  
Earnings (loss) per share – basic:          
Income (loss) from continuing operations $ 0.52 $ 0.64 $ 1.86 $ 0.96  
Gain (loss) on disposition of discontinued operations – net of tax 0.00 0.03 0.06 0.66  
Net income (loss) $ 0.52 $ 0.67 $ 1.92 $ 1.62  
Diluted shares:          
Weighted average shares outstanding - basic (in shares) 73.7 88.0 76.3 96.2  
Effect of dilutive securities:          
Stock options and restricted stock awards [in shares] 1.4 2.0 1.6 1.9  
Diluted weighted average shares outstanding (in shares) 75.1 90.0 77.9 98.1  
Earnings (loss) per share – diluted:          
Income (loss) from continuing operations $ 0.51 $ 0.63 $ 1.82 $ 0.93  
Gain (loss) on disposition of discontinued operations – net of tax 0.00 0.03 0.06 0.65  
Net income (loss) 0.51 $ 0.66 1.88 $ 1.58  
Other details of antidilutive securities          
Common stock, par value (in dollars per share) $ 0.01   $ 0.01   $ 0.01
Restricted Stock          
Other details of antidilutive securities          
Antidilutive securities excluded from computation of earnings per share (in shares) 0.2   0.1