Debt (Schedule of short-term debt) (Details) (USD $) In Millions, unless otherwise specified	May 26, 2013	May 27, 2012
Short-term Debt [Line Items]
Notes payable	$ 599.7	$ 526.5
Weighted Average Interest Rate	2.00%	2.40%
Commercial Paper [Member] | US [Member]
Short-term Debt [Line Items]
Notes payable	515.5	412.0
Weighted Average Interest Rate	0.20%	0.20%
Financial Institutions [Member]
Short-term Debt [Line Items]
Notes payable	$ 84.2	$ 114.5
Weighted Average Interest Rate	13.00%	10.00%