REVENUES - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Revenue from External Customer [Line Items]
Revenues	$ 8,096.4	$ 7,806.6	$ 6,228.6
Business & Industry
Revenue from External Customer [Line Items]
Revenues	4,089.4	4,095.9	2,853.8
M&D
Revenue from External Customer [Line Items]
Revenues	1,526.7	1,445.2	1,363.1
Education
Revenue from External Customer [Line Items]
Revenues	880.4	834.7	830.8
Aviation
Revenue from External Customer [Line Items]
Revenues	925.7	804.0	651.1
Technical Solutions
Revenue from External Customer [Line Items]
Revenues	674.2	626.8	$ 529.8
Janitorial
Revenue from External Customer [Line Items]
Revenues	4,997.7	4,829.4
Janitorial | Business & Industry
Revenue from External Customer [Line Items]
Revenues	2,745.2	2,746.6
Janitorial | M&D
Revenue from External Customer [Line Items]
Revenues	1,330.8	1,242.4
Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	774.8	720.6
Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	146.9	119.8
Janitorial | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Parking
Revenue from External Customer [Line Items]
Revenues	780.8	703.6
Parking | Business & Industry
Revenue from External Customer [Line Items]
Revenues	408.2	354.3
Parking | M&D
Revenue from External Customer [Line Items]
Revenues	42.5	36.6
Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.8	0.9
Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	329.3	311.7
Parking | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Facility Services
Revenue from External Customer [Line Items]
Revenues	1,226.2	1,302.7
Facility Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	936.0	995.0
Facility Services | M&D
Revenue from External Customer [Line Items]
Revenues	153.4	166.2
Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	104.8	113.2
Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	32.0	28.3
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	674.2	626.8
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	674.2	626.8
Airline Services
Revenue from External Customer [Line Items]
Revenues	417.5	344.2
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	417.5	344.2
Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0