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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Jan. 31, 2018
Apr. 30, 2019
Apr. 30, 2018
Oct. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]            
Income tax expense (benefit) to finalize tax effects of 2017 Act $ (4.4)          
Effective income tax rate expense (benefit) 4.50% (12.90%)   (1.70%) 147.80%  
Change of provisional tax expenses related to 2017 Act     $ 202.0      
Discrete tax benefits $ 23.1          
Unrecognized tax benefits 49.1     $ 49.1   $ 68.9
Unrecognized tax benefits that could be settled $ 3.1     $ 3.1