Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Oct. 31, 2018

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives of Property, Plant and Equipment

We determine depreciation for financial reporting purposes using the straight-line method over the following estimated useful lives:

Category	Years
Computer equipment and software	3–5
Machinery and other equipment	3–5
Transportation equipment	1.5–10
Buildings	10–40
Furniture and fixtures	5

Schedule of Management Reimbursement Revenue by Segment

	Years Ended October 31,
(in millions)	2018		2017		2016
Business & Industry	$	257.1	$	234.1	$	227.8
Aviation	99.9		80.4		78.2
Healthcare	19.5		18.7		17.6
Total	$	376.4	$	333.2	$	323.4