REVENUES - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Revenue from External Customer [Line Items]
Revenues	$ 2,069.6	$ 1,991.3
B&I
Revenue from External Customer [Line Items]
Revenues	1,033.1	1,036.6
M&D
Revenue from External Customer [Line Items]
Revenues	400.9	380.5
Education
Revenue from External Customer [Line Items]
Revenues	220.1	214.9
Aviation
Revenue from External Customer [Line Items]
Revenues	249.5	212.3
Technical Solutions
Revenue from External Customer [Line Items]
Revenues	165.9	147.0
Janitorial
Revenue from External Customer [Line Items]
Revenues	1,275.8	1,239.9
Janitorial | B&I
Revenue from External Customer [Line Items]
Revenues	692.4	687.0
Janitorial | M&D
Revenue from External Customer [Line Items]
Revenues	348.9	329.3
Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	198.0	187.7
Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	36.5	35.9
Janitorial | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Parking
Revenue from External Customer [Line Items]
Revenues	199.1	182.6
Parking | B&I
Revenue from External Customer [Line Items]
Revenues	103.3	96.9
Parking | M&D
Revenue from External Customer [Line Items]
Revenues	13.0	10.7
Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.1	0.3
Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	82.7	74.8
Parking | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Facility Services
Revenue from External Customer [Line Items]
Revenues	311.4	328.8
Facility Services | B&I
Revenue from External Customer [Line Items]
Revenues	237.4	252.6
Facility Services | M&D
Revenue from External Customer [Line Items]
Revenues	39.0	40.5
Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	22.0	27.0
Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	13.0	8.8
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	165.9	147.0
Building & Energy Solutions | B&I
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	165.9	147.0
Airline Services
Revenue from External Customer [Line Items]
Revenues	117.4	92.8
Airline Services | B&I
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	117.4	92.8
Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0