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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, 2021
Oct. 31, 2020
Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes $ 33.5 $ 20.3 $ 17.5
Income tax benefit (9.4) (5.7) (4.9)
Share-based compensation expense, net of taxes 24.1 14.6 12.5
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes 17.6 11.5 9.5
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense before income taxes $ 15.8 $ 8.8 $ 8.0