Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015
Supplemental Cash Flow Elements [Abstract]
Interest paid, net of amounts capitalized	$ 123.8	$ 107.9
Income taxes paid, net of refunds	105.8	203.7
Increase in land, buildings and equipment through accrued purchases	14.1	18.9
Net book value of assets distributed in Four Corners separation, net of deferred tax liabilities	$ 750.4	$ 0.0