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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Earnings per share          
Income (loss) from continuing operations $ 52.4 $ 69.2 $ 191.2 $ 222.1  
Income (loss) from discontinued operations–net of tax (10.1) (30.8) (151.8) (80.2)  
Gain (loss) on disposition of discontinued operations – net of tax (20.9) 0.2 (9.5) 4.8  
Net income (loss) $ 21.4 $ 38.6 $ 29.9 $ 146.7  
Basic shares:          
Weighted average shares outstanding - basic (in shares) 71.3 73.7 71.0 76.3  
Earnings (loss) per share – basic:          
Income (loss) from continuing operations $ 0.73 $ 0.94 $ 2.69 $ 2.91  
Income (loss) from discontinued operations – net of tax (0.14) (0.42) (2.14) (1.05)  
Gain (loss) on disposition of discontinued operations – net of tax (0.29) 0 (0.13) 0.06  
Net income (loss) $ 0.30 $ 0.52 $ 0.42 $ 1.92  
Diluted shares:          
Weighted average shares outstanding - basic (in shares) 71.3 73.7 71.0 76.3  
Effect of dilutive securities:          
Stock options and restricted stock awards [in shares] 0.5 1.4 0.8 1.6  
Diluted weighted average shares outstanding (in shares) 71.8 75.1 71.8 77.9  
Earnings (loss) per share – diluted:          
Income (loss) from continuing operations $ 0.73 $ 0.92 $ 2.66 $ 2.85  
Income (loss) from discontinued operations–net of tax (0.14) (0.41) (2.11) (1.03)  
Gain (loss) on disposition of discontinued operations – net of tax (0.29) 0 (0.13) 0.06  
Net income (loss) 0.30 $ 0.51 0.42 $ 1.88  
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) 1.3 0.2 1.1 0.1