Schedule II (Details) - USD ($) $ in Millions		12 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year		$ 10.8	$ 8.5	$ 6.0
Additions Charged to Costs and Expenses		11.5	2.6	2.5
(Deductions) Recoveries/Other	[1]	(3.3)	(0.3)	0.0
Balance End of Year		19.0	10.8	8.5
Deferred Income Tax Charge [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year		59.1	13.3	13.4
Additions Charged to Costs and Expenses	[2]	2.8	45.9	0.0
(Deductions) Recoveries/Other		(22.8)	(0.1)	(0.1)
Balance End of Year		39.1	$ 59.1	$ 13.3
Previously Unrecorded Deferred Assets [Member] | Deferred Income Tax Charge [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Additions Charged to Costs and Expenses		$ 16.5

[1] Consists of additions representing allowances and recoveries, less deductions representing receivables written off as uncollectible.

[2] includes $16.5 million of valuation allowance from prior years as a result of the sale of investment in research and development credits.