Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Retirement Benefits [Abstract]
Plan expenses	$ 17.4	$ 23.4	$ 18.8
Projected benefit obligation	33.4	39.5
Fair value of the plan assets	29.5	38.0
Funded status of plans	(3.9)	(1.5)
Amounts recognized in AOCL, net of tax	5.1	4.9
Net expense recognized	$ (0.2)	$ (6.6)	$ 0.2