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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock options          
Stock-based compensation          
Weighted-average grant-date fair value of options granted (in dollars per share) $ 20.20   $ 18.97 $ 22.51 $ 18.01
Total intrinsic value of options exercised $ 14.7   $ 8.5 $ 32.9 $ 40.9
Cash received from option exercises 7.1   $ 5.5 13.6 $ 19.1
Total unrecognized compensation expense related to non-vested shares granted to employees $ 121.1     $ 121.1  
Cost expected to be recognized over a weighted-average period       3 years  
Stock units expected to vest (in shares) 18,673     18,673  
Restricted stock units          
Stock-based compensation          
Total unrecognized compensation expense related to non-vested shares granted to employees $ 22.2     $ 22.2  
Cost expected to be recognized over a weighted-average period       2 years 1 month 6 days  
Stock units expected to vest (in shares) 500     500  
Number of Shares          
Non-vested at the beginning of the period (in shares)   530   530  
Granted (in shares) 48 221      
Vested (in shares)       (262)  
Forfeited/cancelled (in shares)       (6)  
Non-vested at the end of the period (in shares) 531     531  
Weighted Average Grant-Date Fair Value          
Non-vested at the beginning of the period (in dollars per share)   $ 45.09   $ 45.09  
Granted (in dollars per share) $ 52.31 $ 58.75 $ 50.86 57.59 $ 46.65
Vested (in dollars per share)       45.36  
Forfeited/cancelled (in dollars per share)       32.17  
Non-vested at the end of the period (in dollars per share) $ 51.45     $ 51.45