Share-Based Compensation Plans - Compensation Expense by Type of Award and Related Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense before income taxes	$ 17.5	$ 17.0	$ 13.3
Income tax benefit	(4.9)	(5.1)	(5.4)
Share-based compensation expense, net of taxes	12.5	11.8	7.9
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense before income taxes	9.5	9.3	7.2
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense before income taxes	$ 8.0	$ 7.7	$ 6.1

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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