Revenues - Contract with Customer, Asset and Liability (Details) - USD ($)	6 Months Ended
	Apr. 30, 2021	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Billed trade receivables	$ 812,500,000	$ 835,800,000
Unbilled trade receivables	100,600,000	53,900,000
Costs incurred in excess of amounts billed	37,700,000	52,200,000
Capitalized commissions	27,200,000	$ 25,200,000
Capitalized contract price	8,600,000
Capitalized contract cost, amortization	6,600,000
Capitalized contract cost, impairment loss	0
Contract with Customer, Liabilities [Roll Forward]
Contract liabilities, balance at beginning of period	36,400,000
Additional contract liabilities	72,200,000
Recognition of deferred revenue	(61,000,000.0)
Contract liabilities, balance at end of period	$ 47,600,000