Revenues - Contract with Customer, Asset and Liability (Details) - USD ($)	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Revenue from Contract with Customer [Abstract]
Billed trade receivables	$ 835,800,000	$ 978,700,000
Unbilled trade receivables	53,900,000	56,900,000
Costs incurred in excess of amounts billed	52,200,000	72,600,000
Capitalized commissions	25,200,000	$ 21,800,000
Capitalized contract price	16,400,000
Capitalized contract cost, amortization	13,000,000.0
Capitalized Contract Cost, Impairment Loss	0
Contract with Customer, Liabilities [Roll Forward]
Contract liabilities, balance at beginning of period	38,000,000.0
Additional contract liabilities	315,500,000
Recognition of deferred revenue	(317,100,000)
Contract liabilities, balance at end of period	$ 36,400,000