Restructuring, Impairment, and Other Exit Costs (Schedule of restructuring and other exit cost reserves) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 26, 2013	May 27, 2012	May 29, 2011
Restructuring Reserve [Line Items]
Reserve beginning balance	$ 85.9	$ 7.2	$ 10.8
Restructuring charges, including foreign currency translation	10.6	82.4	0
Restructuring reserve utilized	(77.0)	(3.7)	(3.6)
Reserve ending balance	19.5	85.9	7.2
Employee Severance [Member]
Restructuring Reserve [Line Items]
Reserve beginning balance	83.1	1.7	2.6
Restructuring charges, including foreign currency translation	10.6	82.4	0
Restructuring reserve utilized	(74.2)	(1.0)	(0.9)
Reserve ending balance	19.5	83.1	1.7
Contract Termination [Member]
Restructuring Reserve [Line Items]
Reserve beginning balance	2.7	5.5	8.1
Restructuring charges, including foreign currency translation	0	0	0
Restructuring reserve utilized	(2.7)	(2.8)	(2.6)
Reserve ending balance	0	2.7	5.5
Other Exit Costs [Member]
Restructuring Reserve [Line Items]
Reserve beginning balance	0.1	0	0.1
Restructuring charges, including foreign currency translation	0	0	0
Restructuring reserve utilized	(0.1)	0.1	(0.1)
Reserve ending balance	$ 0	$ 0.1	$ 0