Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [ABSTRACT]
Net earnings, including earnings attributable to redeemable and noncontrolling interests	$ 603.8	$ 463.9	$ 1,946.1	$ 1,583.8
Other comprehensive income (loss), net of tax:
Foreign currency translation	12.5	(22.0)	102.4	(28.5)
Other fair value changes:
Hedge derivatives	0.1	(6.4)	(10.1)	(15.4)
Reclassification to earnings:
Hedge derivatives	5.4	4.0	4.7	3.6
Amortization of losses and prior service costs	19.8	19.6	59.1	58.8
Other comprehensive income (loss), net of tax	37.8	(4.8)	156.1	18.5
Total comprehensive income	641.6	459.1	2,102.2	1,602.3
Comprehensive income (loss) attributable to redeemable and noncontrolling interests	21.0	(0.3)	107.5	5.9
Comprehensive income attributable to General Mills	$ 620.6	$ 459.4	$ 1,994.7	$ 1,596.4