CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net earnings, including earnings attributable to redeemable and noncontrolling interests	$ 2,210.8	$ 1,786.2	$ 2,163.0
Other comprehensive income (loss), net of tax:
Foreign currency translation	(169.1)	(82.8)	(37.0)
Net actuarial income (loss)	(224.6)	(253.4)	140.1
Other fair value changes:
Securities	0.0	0.0	1.2
Hedge derivatives	3.2	12.1	(50.8)
Reclassification to earnings:
Securities	0.0	(2.0)	(5.1)
Hedge derivatives	4.1	0.9	17.4
Amortization of losses and prior service costs	77.9	84.6	117.6
Other comprehensive income (loss), net of tax	(308.5)	(240.6)	183.4
Total comprehensive income	1,902.3	1,545.6	2,346.4
Comprehensive income (loss) attributable to redeemable and noncontrolling interests	10.1	(10.7)	70.5
Comprehensive income attributable to General Mills	$ 1,892.2	$ 1,556.3	$ 2,275.9