Goodwill and Other Intangible Assets - Estimated Annual Amortization Expense (Details) $ in Millions	Oct. 31, 2018 USD ($)	[1]
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated amortization expense 2019	$ 58.5
Estimated amortization expense 2020	49.3
Estimated amortization expense 2021	43.8
Estimated amortization expense 2022	38.2
Estimated amortization expense 2023	$ 33.6

[1] These amounts could vary as acquisitions of additional intangible assets occur in the future.