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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of fair value measurement inputs) (Details) - USD ($) $ in Millions	May 30, 2021	May 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	$ 68.4	$ 59.4
Other Assets, Fair Value Disclosure	442.5	61.6
Total Assets, Fair Value Disclosure	519.7	117.0
Derivative Liability, Fair Value	(39.2)	(42.1)
Other Liabilities, Fair Value Disclosure	0.0	0.0
Total Liabilities, Fair Value Disclosure	(40.1)	(43.1)
Book value of long-lived assets	3,606.8	3,580.6
Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	31.1	25.4
Derivative Liability, Fair Value	(36.3)	(11.6)
Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	46.1	30.0
Derivative Liability, Fair Value	(3.8)	(31.5)
Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	365.6	4.9
Total Assets, Fair Value Disclosure	376.7	9.5
Other Liabilities, Fair Value Disclosure	0.0	0.0
Total Liabilities, Fair Value Disclosure	(0.8)	(3.4)
Level 1 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Level 1 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	11.1	4.6
Derivative Liability, Fair Value	(0.8)	(3.4)
Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	76.9	56.7
Total Assets, Fair Value Disclosure	143.0	107.5
Other Liabilities, Fair Value Disclosure	0.0	0.0
Total Liabilities, Fair Value Disclosure	(39.3)	(39.7)
Level 2 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	31.1	25.4
Derivative Liability, Fair Value	(36.3)	(11.6)
Level 2 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	35.0	25.4
Derivative Liability, Fair Value	(3.0)	(28.1)
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	0.0	0.0
Total Assets, Fair Value Disclosure	0.0	0.0
Other Liabilities, Fair Value Disclosure	0.0	0.0
Total Liabilities, Fair Value Disclosure	0.0	0.0
Level 3 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Level 3 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Marketable Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	442.5	61.6
Other Liabilities, Fair Value Disclosure	0.0	0.0
Marketable Investments [Member] | Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	365.6	4.9
Other Liabilities, Fair Value Disclosure	0.0	0.0
Marketable Investments [Member] | Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	76.9	56.7
Other Liabilities, Fair Value Disclosure	0.0	0.0
Marketable Investments [Member] | Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	0.0	0.0
Other Liabilities, Fair Value Disclosure	0.0	0.0
Interest Rate Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	29.8	6.0
Derivative Liability, Fair Value	0.0	(8.0)
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	28.8	5.6
Derivative Liability, Fair Value	0.0	(7.8)
Interest Rate Contracts [Member] | Level 1 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Interest Rate Contracts [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	28.8	5.6
Derivative Liability, Fair Value	0.0	(7.8)
Interest Rate Contracts [Member] | Level 3 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Foreign Exchange Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	4.8	38.6
Derivative Liability, Fair Value	(37.9)	(4.0)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2.3	19.8
Derivative Liability, Fair Value	(36.3)	(3.8)
Foreign Exchange Contracts [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2.5	18.8
Derivative Liability, Fair Value	(1.6)	(0.2)
Foreign Exchange Contracts [Member] | Level 1 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Foreign Exchange Contracts [Member] | Level 1 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Foreign Exchange Contracts [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2.3	19.8
Derivative Liability, Fair Value	(36.3)	(3.8)
Foreign Exchange Contracts [Member] | Level 2 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	2.5	18.8
Derivative Liability, Fair Value	(1.6)	(0.2)
Foreign Exchange Contracts [Member] | Level 3 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Foreign Exchange Contracts [Member] | Level 3 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Commodity Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	31.6	6.2
Derivative Liability, Fair Value	(1.3)	(30.1)
Commodity Contracts [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	31.6	6.2
Derivative Liability, Fair Value	(1.3)	(30.1)
Commodity Contracts [Member] | Level 1 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	11.1	4.6
Derivative Liability, Fair Value	(0.8)	(3.4)
Commodity Contracts [Member] | Level 2 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	20.5	1.6
Derivative Liability, Fair Value	(0.5)	(26.7)
Commodity Contracts [Member] | Level 3 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Grain contracts [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	12.0	5.0
Derivative Liability, Fair Value	(0.9)	(1.2)
Grain contracts [Member] | Level 1 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0
Grain contracts [Member] | Level 2 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	12.0	5.0
Derivative Liability, Fair Value	(0.9)	(1.2)
Grain contracts [Member] | Level 3 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	0.0	0.0
Derivative Liability, Fair Value	$ 0.0	$ 0.0

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