Goodwill and Other Intangible Assets - Estimated Annual Amortization Expense (Details) $ in Millions	Oct. 31, 2017 USD ($)	[1]
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated amortization expense 2018	$ 68.2
Estimated amortization expense 2019	61.3
Estimated amortization expense 2020	51.4
Estimated amortization expense 2021	45.2
Estimated amortization expense 2022	$ 39.3

[1] These amounts could vary as acquisitions of additional intangible assets occur in the future and as purchase price allocations are finalized for existing acquisitions.