REVENUES - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2022
Revenue from External Customer [Line Items]
Revenues	$ 8,359.4	$ 8,096.4	$ 7,806.6
Business & Industry
Revenue from External Customer [Line Items]
Revenues	4,059.1	4,089.4	4,095.9
M&D
Revenue from External Customer [Line Items]
Revenues	1,554.3	1,526.7	1,445.2
Education
Revenue from External Customer [Line Items]
Revenues	904.0	880.4	834.7
Aviation
Revenue from External Customer [Line Items]
Revenues	1,032.6	925.7	804.0
Technical Solutions
Revenue from External Customer [Line Items]
Revenues	809.3	674.2	$ 626.8
Janitorial
Revenue from External Customer [Line Items]
Revenues	5,116.1	4,997.7
Janitorial | Business & Industry
Revenue from External Customer [Line Items]
Revenues	2,781.4	2,745.2
Janitorial | M&D
Revenue from External Customer [Line Items]
Revenues	1,347.0	1,330.8
Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	798.7	774.8
Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	189.0	146.9
Janitorial | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Parking
Revenue from External Customer [Line Items]
Revenues	804.9	780.8
Parking | Business & Industry
Revenue from External Customer [Line Items]
Revenues	418.9	408.2
Parking | M&D
Revenue from External Customer [Line Items]
Revenues	51.2	42.5
Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.4	0.8
Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	334.5	329.3
Parking | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Facility Services
Revenue from External Customer [Line Items]
Revenues	1,167.2	1,226.2
Facility Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	858.9	936.0
Facility Services | M&D
Revenue from External Customer [Line Items]
Revenues	156.1	153.4
Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	105.0	104.8
Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	47.3	32.0
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	809.3	674.2
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	809.3	674.2
Airline Services
Revenue from External Customer [Line Items]
Revenues	461.8	417.5
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	461.8	417.5
Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0