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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of unallocated corporate items) (Details) - USD ($)
$ in Millions
 12 Months Ended
May 30, 2021
May 31, 2020
May 26, 2019
Commodity Price Risk [Abstract]      
Net gain (loss) on mark-to-market valuation of commodity positions $ 138.2 $ (63.0) $ (39.0)
Net gain (loss) on commodity positions reclassified from unallocated corporate items to segment operating profit (8.8) 35.6 10.0
Net mark-to-market revaluation of certain grain inventories 9.4 2.7 (7.0)
Net mark-to-market valuation of certain commodity positions recognized in unallocated corporate items $ 138.8 $ (24.7) $ (36.0)