Additional Financial Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Additional Financial Information [Abstract]
Interest paid, net of amounts capitalized	$ 155.5	$ 37.0	$ 140.8
Income taxes paid, net of refunds	25.7	106.2	128.0
Increase in land, buildings and equipment through accrued purchases	37.5	22.8	14.9
Net book value of assets distributed in Four Corners separation, net of deferred tax liabilities	0.0	$ 0.0	750.4
Extinguishment of debt, cash portion	$ 97.3		$ 68.7