Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of gains and losses on hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Derivative Instruments Gain (Loss) [Line Items]
Hedge derivatives	$ 3.2	$ 12.1	$ (50.8)
Cash Flow Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Hedge derivatives	4.4	15.7
Amount of net gain (loss) reclassified from AOCI into earnings	(4.9)	(0.6)
Amount of net gain (loss) recognized in earnings	0.0	0.5
Fair Value Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	(4.9)	2.4
Not Designated as Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	(32.7)	(25.4)
Interest Rate Contracts [Member] \| Cash Flow Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Hedge derivatives	(6.9)	0.0
Amount of net gain (loss) reclassified from AOCI into earnings	(9.5)	(9.0)
Amount of net gain (loss) recognized in earnings	0.0	0.0
Interest Rate Contracts [Member] \| Fair Value Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	(4.9)	2.4
Interest Rate Contracts [Member] \| Not Designated as Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	(1.4)	0.0
Foreign Exchange Contracts [Member] \| Cash Flow Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Hedge derivatives	11.3	15.7
Amount of net gain (loss) reclassified from AOCI into earnings	4.6	8.4
Amount of net gain (loss) recognized in earnings	0.0	0.5
Foreign Exchange Contracts [Member] \| Fair Value Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	0.0	0.0
Foreign Exchange Contracts [Member] \| Not Designated as Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	15.7	7.5
Equity Contracts [Member] \| Cash Flow Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Hedge derivatives	0.0	0.0
Amount of net gain (loss) reclassified from AOCI into earnings	0.0	0.0
Amount of net gain (loss) recognized in earnings	0.0	0.0
Equity Contracts [Member] \| Fair Value Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	0.0	0.0
Equity Contracts [Member] \| Not Designated as Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	8.6	0.7
Commodity Contracts [Member] \| Cash Flow Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Hedge derivatives	0.0	0.0
Amount of net gain (loss) reclassified from AOCI into earnings	0.0	0.0
Amount of net gain (loss) recognized in earnings	0.0	0.0
Commodity Contracts [Member] \| Fair Value Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	0.0	0.0
Commodity Contracts [Member] \| Not Designated as Hedging [Member]
Derivative Instruments Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in earnings	$ (55.6)	$ (33.6)