Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate (percent)	29.90%	18.90%	(444.60%)	24.50%
Nondeductible impairment			$ 163.8
Effective income tax rate, excluding impairment (percent)			28.00%
Income tax provision	$ (24.0)	$ (8.5)	$ (43.2)	$ (25.8)
Income tax benefit related to deduction for energy efficiency	$ (0.8)		(1.2)
Discrete tax benefit from expiring statute of limitations		(2.0)		(2.0)
Tax benefit from certain credits		$ (0.5)
Increase (decrease) in tax credits, work opportunity tax credit			1.9	1.3
Unrecognized tax benefits, increase resulting from current period tax positions				1.4
Income tax benefit related to vesting of share-based compensation awards				$ (1.1)
Social security tax, employer, deferral, CARES Act			$ 58.0