Investments in Unconsolidated Joint Ventures (Summarized Joint Venture Financial Statement Activity On 100% Basis) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 28, 2023	Feb. 26, 2023	Nov. 27, 2022	Aug. 28, 2022	May 29, 2022	Feb. 27, 2022	Nov. 28, 2021	Aug. 29, 2021	May 28, 2023	May 29, 2022	May 30, 2021
Schedule of Equity Method Investments [Line Items]
Net sales									$ 1,957.4	$ 2,134.3	$ 2,189.2
Gross margin	$ 1,728.2	$ 1,664.8	$ 1,705.1	$ 1,447.7	$ 1,769.9	$ 1,403.7	$ 1,631.2	$ 1,597.4
Earnings before income taxes									169.3	249.9	247.8
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									2,609.6	2,735.0	2,346.0
Total current assets	5,176.4				5,089.8				5,176.4	5,089.8
Current liabilities	7,535.7				8,019.9				7,535.7	8,019.9
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Gross margin									667.7	803.1	882.9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									126.9	201.0	201.7
Total current assets	817.7				823.9				817.7	823.9
Noncurrent assets	772.7				839.8				772.7	839.8
Current liabilities	1,300.0				1,298.8				1,300.0	1,298.8
Noncurrent liabilities	$ 100.3				$ 106.5				100.3	106.5
Cereal Partners Worldwide [Member]
Schedule of Equity Method Investments [Line Items]
Net sales									1,618.9	1,706.5	1,766.8
Haagen Dazs Japan [Member]
Schedule of Equity Method Investments [Line Items]
Net sales									$ 338.5	$ 427.8	$ 422.4