Retirement and Postemployment Benefits (Schedule of components of net pension, other postretirement, and postemployment (income) expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
Retirement and Postemployment Benefits [Abstract]
Increase (decrease) in service and interest cost for current period resulting from change in estimate methodology	$ (17.0)		$ (34.0)
Increase (decrease) in estimated service and interest cost for fiscal year resulting from change in estimate methodology			$ (68.0)
Expected rate of return on plan assets			8.25%
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	30.0	$ 33.7	$ 60.0	$ 67.4
Interest cost	54.1	67.0	108.3	134.0
Expected return on plan assets	(121.7)	(124.3)	(243.5)	(248.6)
Amortization of losses	47.6	47.3	95.0	94.7
Amortization of prior service costs (credits)	0.6	1.2	1.2	2.4
Other adjustments	2.1	5.0	2.1	5.0
Settlement or curtailment losses	2.9	11.3	4.4	11.3
Net expense (income)	15.6	41.2	27.5	66.2
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.1	4.7	6.2	9.5
Interest cost	7.9	11.0	16.0	22.0
Expected return on plan assets	(12.1)	(11.5)	(24.2)	(23.1)
Amortization of losses	0.7	1.6	1.3	3.3
Amortization of prior service costs (credits)	(1.3)	(1.3)	(2.6)	(2.7)
Other adjustments	1.3	2.4	1.3	2.4
Settlement or curtailment losses	0.7	0.2	0.7	0.2
Net expense (income)	0.3	7.1	(1.3)	11.6
Postemployment Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.2	1.9	4.4	3.8
Interest cost	0.7	1.0	1.4	2.0
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of losses	0.5	0.2	0.9	0.4
Amortization of prior service costs (credits)	0.1	0.6	0.3	1.2
Other adjustments	3.4	3.3	6.8	6.5
Settlement or curtailment losses	0.0	0.0	0.0	0.0
Net expense (income)	$ 6.9	$ 7.0	$ 13.8	$ 13.9