Schedule II (Details) - USD ($) $ in Millions		12 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year		$ 8.5	$ 6.0	$ 6.0
Additions Charged to Costs and Expenses		2.6	2.5	1.7
(Deductions) Recoveries/Other	[1]	(0.3)	0.0	(1.7)
Balance End of Year		10.8	8.5	6.0
Deferred Income Tax Charge [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Year		13.3	13.4	14.5
Additions Charged to Costs and Expenses	[2]	45.9	0.0	0.0
(Deductions) Recoveries/Other		(0.1)	(0.1)	(1.1)
Balance End of Year		59.1	$ 13.3	$ 13.4
Previously Unrecorded Deferred Assets [Member] | Deferred Income Tax Charge [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Additions Charged to Costs and Expenses		$ 37.8

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

[2] Addition includes $37.8 million of valuation allowance from prior years as a result of previously unrecorded deferred assets that have been subject to a full valuation allowance.