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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of available for sale securities) (Details) - USD ($)
$ in Millions
12 Months Ended
May 30, 2021
May 31, 2020
Financial Instruments, Risk Management Activities, and Fair Values [Abstract]    
Cost $ 76.9 $ 56.7
Cost 360.3 0.3
Cost, Total 437.2 57.0
Fair Value 76.9 56.7
Fair Value 365.6 4.9
Fair Value, Total 442.5 61.6
Gross Gains 0.0 0.0
Gross Gains 5.3 4.6
Gross Gains, Total 5.3 4.6
Gross Losses 0.0 0.0
Gross Losses 0.0 0.0
Gross Losses, Total $ 0.0 $ 0.0