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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Income        
Net Income, Basic $ 25.0 $ 41.5 $ 61.1 $ 76.4
Net Income, Diluted $ 25.0 $ 41.5 $ 61.1 $ 76.4
Weighted Average Common Shares        
Basic (in shares) 42.8 43.5 43.1 43.5
Effect of Dilutive Securities (in shares) 0.4 0.5 0.4 0.5
Diluted (in shares) 43.2 44.0 43.5 44.0
Per Common Share Amount        
Net income, Basic (in dollars per share) $ 0.58 $ 0.95 $ 1.42 $ 1.76
Effect of Dilutive Securities (in dollars per shares)   (0.01) (0.02) (0.02)
Net income, Diluted (in dollars per share) $ 0.58 $ 0.94 $ 1.40 $ 1.74