Revenues - Contract with Customer, Asset and Liability (Details) - USD ($)	9 Months Ended
	Jul. 31, 2021	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Billed trade receivables	$ 826,700,000	$ 835,800,000
Unbilled trade receivables	115,300,000	53,900,000
Costs incurred in excess of amounts billed	43,000,000.0	52,200,000
Capitalized commissions	26,900,000	$ 25,200,000
Capitalized contract price	11,900,000
Capitalized contract cost, amortization	10,200,000
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	134,100,000
Recognition of deferred revenue	(114,900,000)
Contract liabilities, balance at end of period	$ 55,600,000