Financial Instruments, Risk Management Activities, and Fair Values (Schedule of fair value measurement inputs) (Details) - USD ($) $ in Millions		12 Months Ended
		May 27, 2018		May 28, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		$ 43.4		$ 30.8
Other Assets, Fair Value Disclosure		117.9		319.1
Total Assets, Fair Value Disclosure		164.6		350.5
Derivative Liability, Fair Value		(15.6)		(18.9)
Other Liabilities, Fair Value Disclosure		0.0		0.0
Total Liabilities, Fair Value Disclosure		(16.1)		(24.4)
Book value of long-lived assets		4,047.2		3,687.7
Long-Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		10.0	[1]	43.7	[2]
Other Liabilities, Fair Value Disclosure		0.0	[1]	0.0	[2]
Non-cash impairment charge of long-lived assets		9.0		47.4
Book value of long-lived assets		19.0		91.1
Indefinite-lived Intangible Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	[3]	79.0
Other Liabilities, Fair Value Disclosure	[3]	0.0
Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		9.4		17.0
Derivative Liability, Fair Value		(13.0)		(4.0)
Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		37.3		14.4
Derivative Liability, Fair Value		(3.1)		(20.4)
Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		3.5		9.9
Total Assets, Fair Value Disclosure		18.2		14.0
Other Liabilities, Fair Value Disclosure		0.0		0.0
Total Liabilities, Fair Value Disclosure		(0.5)		(3.4)
Level 1 [Member] | Long-Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		0.0	[1]	0.0	[2]
Other Liabilities, Fair Value Disclosure		0.0	[1]	0.0	[2]
Level 1 [Member] | Indefinite-lived Intangible Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	[3]	0.0
Other Liabilities, Fair Value Disclosure	[3]	0.0
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		14.7		4.1
Derivative Liability, Fair Value		(0.5)		(3.4)
Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		35.4		309.2
Total Assets, Fair Value Disclosure		67.4		336.5
Other Liabilities, Fair Value Disclosure		0.0		0.0
Total Liabilities, Fair Value Disclosure		(15.6)		(21.0)
Level 2 [Member] | Long-Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		10.0	[1]	43.7	[2]
Other Liabilities, Fair Value Disclosure		0.0	[1]	0.0	[2]
Level 2 [Member] | Indefinite-lived Intangible Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	[3]	0.0
Other Liabilities, Fair Value Disclosure	[3]	0.0
Level 2 [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		9.4		17.0
Derivative Liability, Fair Value		(13.0)		(4.0)
Level 2 [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		22.6		10.3
Derivative Liability, Fair Value		(2.6)		(17.0)
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		79.0		0.0
Total Assets, Fair Value Disclosure		79.0		0.0
Other Liabilities, Fair Value Disclosure		0.0		0.0
Total Liabilities, Fair Value Disclosure		0.0		0.0
Level 3 [Member] | Long-Lived Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure		0.0	[1]	0.0	[2]
Other Liabilities, Fair Value Disclosure		0.0	[1]	0.0	[2]
Level 3 [Member] | Indefinite-lived Intangible Assets [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Other Assets, Fair Value Disclosure	[3]	79.0
Other Liabilities, Fair Value Disclosure	[3]	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	[4],[5]	28.9		275.4
Other Liabilities, Fair Value Disclosure	[4],[5]	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	[4],[5]	3.5		9.9
Other Liabilities, Fair Value Disclosure	[4],[5]	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	[4],[5]	25.4		265.5
Other Liabilities, Fair Value Disclosure	[4],[5]	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	[4],[5]	0.0		0.0
Other Liabilities, Fair Value Disclosure	[4],[5]	0.0		0.0
Interest Rate Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		0.0		0.9
Derivative Liability, Fair Value		(6.9)		(0.5)
Interest Rate Contracts [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	[5],[6]	0.0		0.7
Derivative Liability, Fair Value	[5],[6]	(6.6)		(0.4)
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	[5],[6]	0.0		0.0
Derivative Liability, Fair Value	[5],[6]	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	[5],[6]	0.0		0.7
Derivative Liability, Fair Value	[5],[6]	(6.6)		(0.4)
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	[5],[6]	0.0		0.0
Derivative Liability, Fair Value	[5],[6]	0.0		0.0
Foreign Exchange Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		11.8		16.5
Derivative Liability, Fair Value		(7.2)		(10.2)
Foreign Exchange Contracts [Member] | Designated as Hedging Instrument [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	[7],[8]	9.4		16.3
Derivative Liability, Fair Value	[7],[8]	(6.4)		(3.6)
Foreign Exchange Contracts [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	[7],[8]	2.5		0.2
Derivative Liability, Fair Value	[7],[8]	(0.8)		(6.6)
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	[7],[8]	0.0		0.0
Derivative Liability, Fair Value	[7],[8]	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	[7],[8]	0.0		0.0
Derivative Liability, Fair Value	[7],[8]	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	[7],[8]	9.4		16.3
Derivative Liability, Fair Value	[7],[8]	(6.4)		(3.6)
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	[7],[8]	2.5		0.2
Derivative Liability, Fair Value	[7],[8]	(0.8)		(6.6)
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	[7],[8]	0.0		0.0
Derivative Liability, Fair Value	[7],[8]	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	[7],[8]	0.0		0.0
Derivative Liability, Fair Value	[7],[8]	0.0		0.0
Commodity Contracts [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value		27.7		11.5
Derivative Liability, Fair Value		(1.1)		(8.2)
Commodity Contracts [Member] | Not Designated as Hedging [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative Asset, Fair Value	[8],[9]	27.7		11.5
Derivative Liability, Fair Value	[8],[9]	(1.1)		(8.2)
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	[8],[9]	14.7		4.1
Derivative Liability, Fair Value	[8],[9]	(0.5)		(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	[8],[9]	13.0		7.4
Derivative Liability, Fair Value	[8],[9]	(0.6)		(4.8)
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	[8],[9]	0.0		0.0
Derivative Liability, Fair Value	[8],[9]	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	[8],[9]	7.1		2.7
Derivative Liability, Fair Value	[8],[9]	(1.2)		(5.6)
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	[8],[9]	0.0		0.0
Derivative Liability, Fair Value	[8],[9]	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	[8],[9]	7.1		2.7
Derivative Liability, Fair Value	[8],[9]	(1.2)		(5.6)
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	[8],[9]	0.0		0.0
Derivative Liability, Fair Value	[8],[9]	$ 0.0		$ 0.0

[1] We recorded $9.0 million in non-cash impairment charges in fiscal 2018 to write down certain long-lived assets to their fair value. Fair value was based on recently reported transactions for similar assets in the marketplace. These assets had a carrying value of $19.0 million and were associated with the restructuring actions described in Note 4 .

[2] We recorded $47.4 million in non-cash impairment charges in fiscal 2017 to write down certain long-lived assets to their fair value. Fair value was based on recently reported transactions for similar assets in the marketplace. These assets had a carrying value of $91.1 million and were associated with the restructuring actions described in Note 4.

[3] See Note 6 .

[4] Based on prices of common stock and bond matrix pricing.

[5] These contracts and investments are recorded as prepaid expenses and other current assets, other assets, other current liabilities or other liabilities, as appropriate, based on whether in a gain or loss position. Certain marketable investments are recorded as cash and cash equivalents.

[6] Based on LIBOR and swap rates.

[7] Based on observable market transactions of spot currency rates and forward currency prices.

[8] These contracts are recorded as prepaid expenses and other current assets, other assets, other current liabilities or other liabilities, as appropriate, based on whether in a gain or loss position.

[9] Based on prices of futures exchanges and recently reported transactions in the marketplace.