Retirement and Postemployment Benefits (Schedule of Components of net periodic benefit (income) expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 29, 2021	Aug. 30, 2020
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 23.7	$ 26.0
Interest cost	46.3	48.0
Expected return on plan assets	(102.8)	(105.0)
Amortization of losses (gains)	34.9	26.8
Amortization of prior service costs (credits)	0.2	0.3
Other adjustments	0.0	0.0
Curtailment gain	(14.8)	0.0
Net (income) expense	(12.5)	(3.9)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.9	2.2
Interest cost	3.2	4.5
Expected return on plan assets	(6.7)	(8.7)
Amortization of losses (gains)	(2.7)	(1.3)
Amortization of prior service costs (credits)	(5.2)	(1.4)
Other adjustments	0.0	0.0
Curtailment gain	(5.5)	0.0
Net (income) expense	(15.0)	(4.7)
Postemployment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.8	2.3
Interest cost	0.4	0.4
Expected return on plan assets	0.0	0.0
Amortization of losses (gains)	0.8	0.7
Amortization of prior service costs (credits)	0.1	0.2
Other adjustments	1.9	2.2
Curtailment gain	0.0	0.0
Net (income) expense	$ 5.0	$ 5.8