REVENUES - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Revenue from External Customer [Line Items]
Revenues	$ 1,936.2	$ 1,492.4
Operating Segments
Revenue from External Customer [Line Items]
Revenues	1,936.2	1,492.4
Operating Segments | Business & Industry
Revenue from External Customer [Line Items]
Revenues	1,029.5	690.1
Operating Segments | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	359.1	340.8
Operating Segments | Education
Revenue from External Customer [Line Items]
Revenues	205.7	208.0
Operating Segments | Aviation
Revenue from External Customer [Line Items]
Revenues	200.3	140.9
Operating Segments | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	141.8	112.6
Operating Segments | Janitorial
Revenue from External Customer [Line Items]
Revenues	1,190.2	1,032.6
Operating Segments | Janitorial | Business & Industry
Revenue from External Customer [Line Items]
Revenues	677.9	533.0
Operating Segments | Janitorial | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	304.2	287.4
Operating Segments | Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	178.3	183.1
Operating Segments | Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	29.8	29.1
Operating Segments | Janitorial | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Parking
Revenue from External Customer [Line Items]
Revenues	172.0	134.9
Operating Segments | Parking | Business & Industry
Revenue from External Customer [Line Items]
Revenues	83.2	68.9
Operating Segments | Parking | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	10.7	11.7
Operating Segments | Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.3	0.2
Operating Segments | Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	77.7	54.2
Operating Segments | Parking | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Facility Services
Revenue from External Customer [Line Items]
Revenues	346.0	160.6
Operating Segments | Facility Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	268.4	88.2
Operating Segments | Facility Services | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	44.1	41.7
Operating Segments | Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	27.1	24.8
Operating Segments | Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	6.5	5.9
Operating Segments | Facility Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Building & Energy Solutions
Revenue from External Customer [Line Items]
Revenues	141.8	112.6
Operating Segments | Building & Energy Solutions | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Building & Energy Solutions | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Building & Energy Solutions | Education
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Building & Energy Solutions | Aviation
Revenue from External Customer [Line Items]
Revenues	0.0
Operating Segments | Building & Energy Solutions | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	141.8	112.6
Operating Segments | Airline Services
Revenue from External Customer [Line Items]
Revenues	86.3	51.7
Operating Segments | Airline Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Airline Services | Manufacturing & Distribution
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Airline Services | Education
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Airline Services | Aviation
Revenue from External Customer [Line Items]
Revenues	86.3	51.7
Operating Segments | Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	$ 0.0	$ 0.0