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SHARE-BASED PAYMENTS (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2016
Feb. 22, 2015
Feb. 28, 2016
Feb. 22, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 23.1 $ 11.4 $ 60.5 $ 46.4
Weighted average value of stock options granted (in dollars per share)     $ 5.08  
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock granted, shares (in shares)     1.0  
Weighted average grant date price (in dollars per share)     $ 43.64  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock granted, shares (in shares)     0.8  
Weighted average grant date price (in dollars per share)     $ 44.49  
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option granted (in shares)     1.6  
Weighted average exercise price of stock options granted (in dollars per share)     $ 43.14  
Performance shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock granted, shares (in shares)     0.3  
Weighted average grant date price (in dollars per share)     $ 41.70  
Performance shares for period ending 2016 and 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target incentive required payout     25.00%  
Performance shares for period ending 2016 and 2017 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of the targeted number of performance shares paid in shares of common stock     0.00%  
Performance shares for period ending 2016 and 2017 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of the targeted number of performance shares paid in shares of common stock     220.00%  
Performance shares for period ending 2018 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of the targeted number of performance shares paid in shares of common stock     0.00%  
Performance shares for period ending 2018 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of the targeted number of performance shares paid in shares of common stock     200.00%  
Subsidiaries | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 0.5 $ 0.3 $ 0.7 $ 0.9