Revenue - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2019	Nov. 01, 2018
Revenue from Contract with Customer [Abstract]
Billed trade receivables	$ 971.5	$ 918.9
Unbilled trade receivables	91.1	74.3
Costs incurred in excess of amounts billed	40.2	40.1
Capitalized commissions	16.1	$ 15.1
Capitalized contract price	2.1
Capitalized contract cost, amortization	1.2
Contract with Customer, Liabilities [Roll Forward]
Contract liabilities, balance at beginning of period	41.7
Additional contract liabilities	92.6
Recognition of deferred revenue	(91.7)
Contract liabilities, balance at end of period	$ 42.6