Income Taxes - Components of Income From Continuing Operations Before Income Taxes and Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 45.2	$ 137.1	$ 94.8
Foreign	8.1	23.1	(7.1)
Income from continuing operations before income taxes	53.3	160.2	87.7
Current:
Federal	(59.3)	(6.4)	(4.3)
State	(28.6)	(10.7)	(7.3)
Foreign	(1.7)	(5.9)	(3.9)
Deferred:
Federal	23.2	(8.5)	21.8
State	12.5	(1.6)	0.2
Foreign	0.9	0.4	1.7
Income tax (provision) benefit	$ (53.1)	$ (32.7)	$ 8.2