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Redeemable and Noncontrolling Interests (Details)
$ in Millions
12 Months Ended
May 26, 2019
May 27, 2018
USD ($)
subsidiaries
May 28, 2017
USD ($)
May 29, 2016
USD ($)
May 31, 2015
USD ($)
Jul. 01, 2011
USD ($)
REDEEMABLE AND NONCONTROLLING INTERESTS [Abstract]            
Number of other noncontrolling interests | subsidiaries   4        
Other noncontrolling interests   $ 12.6        
Noncontrolling Interest [Line Items]            
Redeemable interest value   776.2 $ 910.9      
Noncontrolling interests   351.3 357.6      
Dividends paid under the terms of shareholder agreements   $ 51.8 61.0 $ 84.3    
Noncontrolling interests covenant compliancee   Our noncontrolling interests contain restrictive covenants. As of fiscal year end, we were in compliance with all of these covenants.        
Yoplait SAS Subsidiary [Member]            
Noncontrolling Interest [Line Items]            
Net purchases from related party   $ 230.8 186.4      
Yoplait SAS, Yoplait Marques SNC, and Liberte Marques Sarl [Member]            
Noncontrolling Interest [Line Items]            
Dividends paid under the terms of shareholder agreements   37.7 48.6      
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 distributions, variable rate   three-month LIBOR        
Preferred distributions, basis spread on variable rate   1.25%        
Preferred return rate adjustment period   3 years        
General Mills Cereals LLC [Member] | Preferred Class A [Member] | Third Party Interest Holder [Member] | Subsequent Event [Member]            
Noncontrolling Interest [Line Items]            
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 [Member]            
Noncontrolling Interest [Line Items]            
Ownership interest percentage in consolidated subsidiary   50.00%        
General Mills [Member] | 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   $ 776.2 $ 910.9 $ 845.6 $ 778.9  
Sodiaal International Redeemable Interest [Member] | Yoplait SAS [Member]            
Noncontrolling Interest [Line Items]            
Redeemable interest value   $ 776.2       $ 904.4
Redeemable interest percentage   49.00%        
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.        
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%