Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Pension settlement charge	$ 0.0	$ 1.1	$ 0.0	$ 24.6
Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Derivative, net hedge ineffectiveness, amounts reclassified from AOCI to retained earnings					$ 0.6
Other expense | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit costs, other than the service cost components	$ 1.8		$ 3.6