Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Feb. 25, 2018	Feb. 25, 2018	Feb. 26, 2017
Supplemental Cash Flow Elements [Abstract]
Interest paid, net of amounts capitalized (1)		$ 142.2	$ 24.9
Income taxes paid, net of refunds		40.3	61.3
Increase in land, buildings and equipment through accrued purchases		35.7	$ 25.2
Debt retirement costs, cash portion	$ 97.3	$ 97.3