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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 25, 2018
May 31, 2020
May 26, 2019
May 27, 2018
May 28, 2017
Derivative Instruments, Gain (Loss) [Line Items]          
Period to hedge portion of anticipated consumption of commodity inputs (up to)   36 months      
Gain recognized in other comprehensive income   $ (7.1) $ 45.5 $ 2.9  
Deferred gain in AOCI upon settlement of contracts   7,950.7 7,463.7 3,756.6 $ 4,077.8
Setoff amounts applied against total derivative assets   0.4 0.5    
Setoff amounts applied against total derivative liabilities   1.5 0.4    
Level 2          
Derivative Instruments, Gain (Loss) [Line Items]          
Maximum amount of loss due to credit risk of counterparties   5.2      
Prepaid expenses and other current assets          
Derivative Instruments, Gain (Loss) [Line Items]          
Amounts representing a right to reclaim cash collateral   1.1      
Amount representing obligation to return cash     0.1    
Cash flow hedge, Pinnacle          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain recognized in other comprehensive income $ 47.5        
Commodity contracts | Purchase contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional value of contracts   102.0 140.1    
Commodity contracts | Sales contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional value of contracts   3.4 18.5    
Foreign currency forward and cross currency swap contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional value of contracts   107.6 88.2    
Derivative adjustments, net of reclassification adjustments          
Derivative Instruments, Gain (Loss) [Line Items]          
Deferred gain in AOCI upon settlement of contracts   26.3 $ 34.0 $ 1.0  
Derivative adjustments, net of reclassification adjustments | Cash flow hedge, Pinnacle          
Derivative Instruments, Gain (Loss) [Line Items]          
Deferred gain in AOCI upon settlement of contracts   $ 42.0