Investments in Unconsolidated Joint Ventures (Schedule of joint venture earnings and cash flow activity) (Details) - USD ($) $ in Millions	12 Months Ended
May 28, 2017	May 29, 2016	May 31, 2015
Schedule of Equity Method Investments [Line Items]
Net advances (repayments)	$ (3.3)	$ (63.9)	$ 102.4
Dividends received	75.6	75.1	72.6
Corporate Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Sales to joint ventures	7.0	10.5	11.6
Net advances (repayments)	(3.3)	(63.9)	102.4
Dividends received	$ 75.6	$ 75.1	$ 72.6

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Balance Type:	debit
Period Type:	duration