Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Revenue from External Customer [Line Items]
Revenues	$ 6,228.6	$ 5,987.6	$ 6,498.6
Operating Segments
Revenue from External Customer [Line Items]
Revenues	6,372.9	6,110.0
Operating Segments | Business & Industry
Revenue from External Customer [Line Items]
Revenues	3,346.5	3,157.8	3,251.4
Operating Segments | Technology & Manufacturing
Revenue from External Customer [Line Items]
Revenues	987.1	956.0	917.0
Operating Segments | Education
Revenue from External Customer [Line Items]
Revenues	836.4	808.8	847.4
Operating Segments | Aviation
Revenue from External Customer [Line Items]
Revenues	668.8	680.9	1,017.3
Operating Segments | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	534.0	506.6	593.2
Operating Segments | Janitorial
Revenue from External Customer [Line Items]
Revenues	4,290.3	4,029.0
Operating Segments | Janitorial | Business & Industry
Revenue from External Customer [Line Items]
Revenues	2,651.7	2,420.4
Operating Segments | Janitorial | Technology & Manufacturing
Revenue from External Customer [Line Items]
Revenues	790.5	770.9
Operating Segments | Janitorial | Education
Revenue from External Customer [Line Items]
Revenues	730.8	716.5
Operating Segments | Janitorial | Aviation
Revenue from External Customer [Line Items]
Revenues	117.2	121.2
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	599.4	654.0
Operating Segments | Parking | Business & Industry
Revenue from External Customer [Line Items]
Revenues	296.9	362.8
Operating Segments | Parking | Technology & Manufacturing
Revenue from External Customer [Line Items]
Revenues	39.8	33.5
Operating Segments | Parking | Education
Revenue from External Customer [Line Items]
Revenues	0.9	1.8
Operating Segments | Parking | Aviation
Revenue from External Customer [Line Items]
Revenues	261.8	255.9
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	687.8	647.9
Operating Segments | Facility Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	397.4	374.1
Operating Segments | Facility Services | Technology & Manufacturing
Revenue from External Customer [Line Items]
Revenues	156.8	151.6
Operating Segments | Facility Services | Education
Revenue from External Customer [Line Items]
Revenues	104.7	90.5
Operating Segments | Facility Services | Aviation
Revenue from External Customer [Line Items]
Revenues	28.9	31.6
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	534.0	506.6
Operating Segments | Building & Energy Solutions | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Operating Segments | Building & Energy Solutions | Technology & Manufacturing
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	0.0
Operating Segments | Building & Energy Solutions | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	534.0	506.6
Operating Segments | Airline Services
Revenue from External Customer [Line Items]
Revenues	261.4	272.6
Operating Segments | Airline Services | Business & Industry
Revenue from External Customer [Line Items]
Revenues	0.5	0.4
Operating Segments | Airline Services | Technology & Manufacturing
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	260.9	272.2
Operating Segments | Airline Services | Technical Solutions
Revenue from External Customer [Line Items]
Revenues	0.0	0.0
Elimination of inter-segment revenues
Revenue from External Customer [Line Items]
Revenues	$ (144.2)	$ (122.4)	$ (127.7)