Financial Instruments, Risk Management Activities, and Fair Values (Schedule of cashflow hedge in AOCI) (Details) - USD ($) $ in Millions	May 29, 2016	May 31, 2015
Derivative [Line Items]
After-tax gain (loss) in AOCI related to hedge derivatives	$ (25.5)	$ (28.8)
Interest Rate Contracts [Member]
Derivative [Line Items]
After-tax gain (loss) in AOCI related to hedge derivatives	(31.3)
Foreign Exchange Contracts [Member]
Derivative [Line Items]
After-tax gain (loss) in AOCI related to hedge derivatives	$ 5.8