CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 36.1	$ 35.8
Other comprehensive income (loss), net of tax:
Foreign currency translation	(3.1)	5.2
Derivative financial instruments, net of immaterial income tax expense	0.2	(5.7)
Minimum pension liabilities	21.7	(0.8)
Other comprehensive income (loss), net of tax	18.8	(1.3)
Comprehensive income	54.9	34.5
Comprehensive income attributable to noncontrolling interests	1.8	7.1
Comprehensive income attributable to Greif, Inc.	$ 53.1	$ 27.4