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Share-Based Compensation Plans - Compensation Expense by Type of Award and Related Income Tax Benefit (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes [1] $ 13.3 $ 14.0 $ 14.2
Income tax benefit (5.4) (6.0) (5.9)
Share-based compensation expense, net of taxes 7.9 8.0 8.3
Share-based compensation expense related to discontinued operations     0.3
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes 7.2 7.1 6.9
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes 6.1 6.7 6.5
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes $ 0.0 $ 0.3 $ 0.8
[1] )Includes share-based compensation expenses related to discontinued operations of $0.3 million for 2015.