Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Oct. 31, 2021

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

Management Reimbursement Revenue by Segment

	Years Ended October 31,
(in millions)	2021		2020		2019
Business & Industry	$	185.8	$	221.4	$	283.1
Aviation	54.5		74.3		95.5
Total	$	240.3	$	295.6	$	378.7