Restructuring, Impairment, and Other Exit Costs (Schedule of restructuring charges classification) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020
Restructuring and Related Cost [Line Items]
Total restructuring and impairment charges	$ 11.7	$ 12.4	$ 13.6	$ 37.2
Project-related costs classified in cost of sales	0.0	0.4	0.0	1.1
Restructuring, impairment, and other exit costs [Member]
Restructuring and Related Cost [Line Items]
Total restructuring and impairment charges	11.0	5.8	11.9	12.9
Cost of Sales [Member]
Restructuring and Related Cost [Line Items]
Total restructuring and impairment charges	$ 0.7	$ 6.6	$ 1.7	$ 24.3