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STOCKHOLDERS' EQUITY Capital Stock Information (Details 1) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended 12 Months Ended 23 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Feb. 16, 2018
Sep. 06, 2017
May 30, 2017
Feb. 16, 2017
Feb. 17, 2015
Dec. 31, 2014
Common stock, shares issued (in shares)   130.4       129.6               130.4 129.6   129.6            
Common Stock, unissued shares (in shares)   169.6                       169.6                  
Shares of common stock in treasury (in shares)   50.2       24.6               50.2 24.6   24.6            
Value of treasury stock on an average cost basis (in dollars)   $ 1,857,700,000       $ 935,100,000               $ 1,857,700,000 $ 935,100,000   $ 935,100,000            
Number of common shares held in rabbi trust (in shares)   0.8       0.9               0.8 0.9   0.9            
Preferred stock, shares authorized (in shares)   50.0                       50.0                  
Preferred stock, par value per share (in dollars per share)   $ 0.01                       $ 0.01                  
Preferred stock, shares outstanding (in shares)   0.0                       0.0                  
Stock Repurchase Program, Authorized Amount                                     $ 225,000,000 $ 280,000,000 $ 350,000,000 $ 200,000,000  
Stock Repurchased During Period, Value                                 $ 131,000,000            
Treasury Stock, Value, Acquired, Cost Method                           $ 926,600,000 $ 84,300,000 $ 52,600,000              
Common Stock, Dividends, Per Share, Cash Paid   $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.06 $ 0.06 $ 0.06 $ 0.06                    
Common Stock                                              
Common stock, shares outstanding (in shares)   80.2       105.0       107.7       80.2 105.0 107.7 105.0           105.4
Shares of common stock in treasury (in shares)   50.2                       50.2                  
Treasury Stock, Shares, Acquired                           25.8 3.6 2.0              
Treasury Stock, Value, Acquired, Cost Method                           $ 0 $ 0 $ 0              
Stock Options and Restricted Stock                                              
Common Stock reserved for contingently issuable shares (in shares)   3.1                       3.1                  
All Company Stock Plans                                              
Number of common shares held in rabbi trust (in shares)   0.8                       0.8                  
Value of common shares held in rabbi trust (in dollars)   $ 18,600,000                       $ 18,600,000                  
Share repurchase program approved by Board of Directors [Member]                                              
Treasury Stock, Shares, Acquired                           25.7 3.5 1.9              
Treasury Stock, Value, Acquired, Cost Method                           $ 923,700,000 $ 81,300,000 $ 50,000,000              
Subsequent Event                                              
Stock Repurchase Program, Authorized Amount                                   $ 325,000,000          
Common stock dividends declared (in dollars per share) $ 0.10