Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Feb. 26, 2012	May 29, 2011
Assets:
Derivative assets	$ 76.8	$ 71.5
Available-for-sale securities	1.8	1.7
Deferred compensation assets	6.5	7.4
Total assets	85.1	80.6
Liabilities:
Derivative liabilities	146.0	92.2
Deferred compensation liabilities	27.9	29.1
Total liabilities	173.9	121.3
Level 1 [Member]
Assets:
Derivative assets	14.1	16.3
Available-for-sale securities	1.8	1.7
Deferred compensation assets	6.5	7.4
Total assets	22.4	25.4
Liabilities:
Deferred compensation liabilities	27.9	29.1
Total liabilities	27.9	29.1
Level 2 [Member]
Assets:
Derivative assets	62.7	55.2
Total assets	62.7	55.2
Liabilities:
Derivative liabilities	146.0	92.2
Total liabilities	146.0	92.2
Level 3 [Member]
Assets:
Derivative assets
Available-for-sale securities
Deferred compensation assets
Total assets
Liabilities:
Derivative liabilities
Deferred compensation liabilities
Total liabilities