REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Revenue from External Customer [Line Items]
Revenues	$ 1,897.8	$ 1,497.4	$ 3,834.1	$ 2,989.8
Operating Segments
Revenue from External Customer [Line Items]
Revenues	1,897.8	1,497.4	3,834.1	2,989.8
Operating Segments | Business & Industry
Revenue from External Customer [Line Items]
Revenues	1,003.6	673.9	2,033.1	1,364.1
Operating Segments | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	356.9	340.3	716.0	681.0
Operating Segments | Education
Revenue from External Customer [Line Items]
Revenues	204.4	212.8	410.1	420.8
Operating Segments | Aviation
Revenue from External Customer [Line Items]
Revenues	185.9	145.9	386.1	286.8
Operating Segments | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	147.0	124.5	288.8	237.1
Operating Segments | Janitorial
Revenue from External Customer [Line Items]
Revenues	1,188.2	1,031.7	2,378.4	2,063.3
Operating Segments | Janitorial | Business & Industry
Revenue from External Customer [Line Items]
Revenues	676.7	527.5	1,354.6	1,060.5
Operating Segments | Janitorial | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	307.2	289.5	611.3	575.9
Operating Segments | Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	177.9	185.9	356.2	369.0
Operating Segments | Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	26.4	28.8	56.2	58.0
Operating Segments | Janitorial | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Parking
Revenue from External Customer [Line Items]
Revenues	171.2	139.1	343.2	274.0
Operating Segments | Parking | Business & Industry
Revenue from External Customer [Line Items]
Revenues	85.1	68.1	168.4	137.0
Operating Segments | Parking | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	8.8	10.0	19.5	21.7
Operating Segments | Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.3	0.2	0.5	0.4
Operating Segments | Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	77.1	60.8	154.8	114.9
Operating Segments | Parking | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Facility Services
Revenue from External Customer [Line Items]
Revenues	315.8	151.5	661.9	313.2
Operating Segments | Facility Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	241.8	78.4	510.2	166.6
Operating Segments | Facility Services | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	41.0	40.7	85.2	83.5
Operating Segments | Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	26.3	26.6	53.3	51.4
Operating Segments | Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	6.8	5.8	13.3	11.7
Operating Segments | Facility Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Building & Energy Solutions
Revenue from External Customer [Line Items]
Revenues	147.0	124.5	288.8	237.1
Operating Segments | Building & Energy Solutions | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Building & Energy Solutions | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Building & Energy Solutions | Education
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Building & Energy Solutions | Aviation
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Building & Energy Solutions | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	147.0	124.5	288.8	237.1
Operating Segments | Airline Services
Revenue from External Customer [Line Items]
Revenues	75.5	50.5	161.8	102.2
Operating Segments | Airline Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Airline Services | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Airline Services | Education
Revenue from External Customer [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Airline Services | Aviation
Revenue from External Customer [Line Items]
Revenues	75.5	50.5	161.8	102.2
Operating Segments | Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0