Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Current:
Federal	$ 1.4	$ 9.2	$ 165.6
State	1.1	1.6	0.5
Foreign	26.5	15.8	23.0
Total Current	29.0	26.6	189.1
Deferred:
Federal	3.2	(8.1)	16.1
State	0.8	(0.9)	1.0
Foreign	(4.9)	(6.9)	(14.2)
Total Deferred	(0.9)	(15.9)	2.9
Income tax provision	$ 28.1	$ 10.7	$ 192.0