Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Feb. 24, 2019	Feb. 25, 2018
Extinguishment of Debt [Line Items]
Interest paid, net of amounts capitalized	$ 37.1	$ 142.2
Income taxes paid, net of refunds	15.0	40.3
Increase in land, buildings and equipment through accrued purchases	$ 37.5	35.7
Long-term debt
Extinguishment of Debt [Line Items]
Interest paid, net of amounts capitalized		$ 97.3