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SHARE-BASED PAYMENTS - Share Unit Plans (Narrative) (Details) - Share Unit Plans - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 27, 2018
May 28, 2017
May 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Stock-settled      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 21.8 $ 18.2 $ 25.1
Tax benefit $ 7.2 $ 7.0 $ 9.6
Share units granted (in shares) 870,000 600,000 1,000,000
Weighted average grant date fair value of share units (in dollars per share) $ 34.16 $ 46.79 $ 43.64
Total intrinsic value of share units vested $ 18.5 $ 27.0 $ 48.8
Unrecognized compensation expense, net of estimated forfeitures, related to share unit awards $ 22.8    
Weighted average period for recognition 1 year 9 months    
Cash-settled      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 5.8 20.9 33.9
Tax benefit $ 1.9 $ 8.0 $ 13.0
Share units granted (in shares) 0 400,000 800,000
Weighted average grant date fair value of share units (in dollars per share) $ 0.00 $ 48.07 $ 44.48
Total intrinsic value of share units vested $ 14.2 $ 24.0 $ 44.9
Unrecognized compensation expense, net of estimated forfeitures, related to share unit awards $ 5.2    
Weighted average period for recognition 1 year    
Discontinued operations | Stock-settled      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense   1.4 3.9
Discontinued operations | Cash-settled      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense   $ 2.6 $ 7.4