REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020
Revenue from External Customer [Line Items]
Revenues	$ 7,806.6	$ 6,228.6	$ 5,987.6
Business & Industry
Revenue from External Customer [Line Items]
Revenues	4,095.9	2,853.8	2,856.4
M&D
Revenue from External Customer [Line Items]
Revenues	1,445.2	1,363.1	1,151.4
Education
Revenue from External Customer [Line Items]
Revenues	834.7	830.8	805.1
Aviation
Revenue from External Customer [Line Items]
Revenues	804.0	651.1	670.7
Technical Solutions
Revenue from External Customer [Line Items]
Revenues	626.8	529.8	$ 504.0
Janitorial
Revenue from External Customer [Line Items]
Revenues	4,829.4	4,179.0
Janitorial | Business & Industry
Revenue from External Customer [Line Items]
Revenues	2,746.6	2,180.2
Janitorial | M&D
Revenue from External Customer [Line Items]
Revenues	1,242.4	1,157.9
Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	720.6	724.1
Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	119.8	116.8
Janitorial | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Parking
Revenue from External Customer [Line Items]
Revenues	703.6	593.8
Parking | Business & Industry
Revenue from External Customer [Line Items]
Revenues	354.3	296.1
Parking | M&D
Revenue from External Customer [Line Items]
Revenues	36.6	39.8
Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.9	0.9
Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	311.7	257.0
Parking | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Facility Services
Revenue from External Customer [Line Items]
Revenues	1,302.7	673.6
Facility Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	995.0	377.5
Facility Services | M&D
Revenue from External Customer [Line Items]
Revenues	166.2	165.4
Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	113.2	105.8
Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	28.3	24.9
Facility Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Building & Energy Solutions
Revenue from External Customer [Line Items]
Revenues	626.8	529.8
Building & Energy Solutions | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Building & Energy Solutions | M&D
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Building & Energy Solutions | Education
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Building & Energy Solutions | Aviation
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Building & Energy Solutions | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	626.8	529.8
Airline Services
Revenue from External Customer [Line Items]
Revenues	344.2	252.4
Airline Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Airline Services | M&D
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Airline Services | Education
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Airline Services | Aviation
Revenue from External Customer [Line Items]
Revenues	344.2	252.4
Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0