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Redeemable and Noncontrolling Interests (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 28, 2021
Feb. 23, 2020
May 31, 2020
Jul. 01, 2011
Noncontrolling Interest [Line Items]        
Redeemable interest value $ 596.0   $ 544.6  
Noncontrolling interests $ 297.6   $ 291.0  
Noncontrolling interests covenant compliancee Our noncontrolling interests contain restrictive covenants. As of February 28, 2021, we were in compliance with all of these covenants.      
General Mills Cereals, LLC [Member] | Preferred Class A [Member] | Third Party Interest Holder [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling Interest Holders Capital Account, General Mills Cereals, LLC $ 251.5      
Preferred return rate adjustment period 3 years      
Preferred distributions variable rate three-month LIBOR      
Preferred distributions, basis spread on variable rate 1.425%      
General Mills [Member] | Yoplait SAS [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest percentage in consolidated subsidiary 51.00%      
General Mills [Member] | Yoplait Marques SNC and Liberte Marques Sarl [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest percentage in consolidated subsidiary 50.00%      
Sodiaal International Redeemable Interest [Member]        
Noncontrolling Interest [Line Items]        
Redeemable interest value $ 596.0      
Sodiaal International Redeemable Interest [Member] | Yoplait SAS [Member]        
Noncontrolling Interest [Line Items]        
Redeemable interest value       $ 904.4
Redeemable interest terms Sodiaal has the ability to put all or a portion of its redeemable interest to us at fair value once per year, up to three times before December 2024.      
Redeemable interest percentage 49.00%      
Sodiaal International Redeemable Interest [Member] | Yoplait SAS Subsidiary [Member]        
Noncontrolling Interest [Line Items]        
Net purchases from related party $ 155.0 $ 141.4    
Sodiaal International Noncontrolling Interest [Member] | Yoplait Marques SNC and Liberte Marques Sarl [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling interests       $ 281.4
Sodiaal International Noncontrolling Interest [Member] | Yoplait Marques SNC [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest percentage held by noncontrolling owners 50.00%      
Sodiaal International Noncontrolling Interest [Member] | Liberte Marques Sarl [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest percentage held by noncontrolling owners 50.00%