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Acquisition and Divestitures (Divestitures) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 29, 2016
Nov. 29, 2015
May 29, 2016
May 31, 2015
May 25, 2014
Divestitures [Line Items]          
Proceeds from divestitures     $ 828.5 $ 0.0 $ 121.6
Pre-tax gain (loss) on sale of business     148.2 0.0 $ 65.5
Brand asset retained $ 4,147.5   $ 4,147.5 $ 4,262.1  
Green Giant Brand [Member] | International [Member]          
Divestitures [Line Items]          
Brand asset retained   $ 30.1      
Sale of North American Green Giant Product Lines [Member]          
Divestitures [Line Items]          
Proceeds from divestitures   822.7      
Pre-tax gain (loss) on sale of business   199.1      
Net cash proceeds   $ 788.0      
General Mills de Venezuela CA Subsidiary [Member]          
Divestitures [Line Items]          
Pre-tax gain (loss) on sale of business (37.6)        
General Mills Argentina S.A. Foodservice Business [Member]          
Divestitures [Line Items]          
Pre-tax gain (loss) on sale of business $ (14.8)