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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 30.9	$ 36.1
Other comprehensive income (loss), net of tax:
Foreign currency translation	27.6	(3.1)
Derivative financial instruments	1.9	0.2
Minimum pension liabilities	22.7	21.7
Other comprehensive income, net of tax	52.2	18.8
Comprehensive income	83.1	54.9
Comprehensive income attributable to noncontrolling interests	10.1	1.8
Comprehensive income attributable to Greif, Inc.	$ 73.0	$ 53.1

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