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STOCK-BASED COMPENSATION - Stock Options (Details)
shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
plan
shares
Mar. 31, 2016
USD ($)
Stock-based compensation    
Stock-based compensation plans | plan 2  
Compensation expense on share-based plans $ 13.1 $ 10.1
Stock options    
Stock-based compensation    
Common stock granted, net of cancellations (in shares) | shares 1,319  
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options $ 9.4 $ 1.6