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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

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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