SEGMENT INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Revenues
Revenues	$ 1,897.8	$ 1,497.4	$ 3,834.1	$ 2,989.8
Operating profit
Operating profit	75.0	50.3	181.0	160.1
Income from unconsolidated affiliates	0.6	0.2	1.0	0.8
Interest expense	(7.8)	(7.8)	(14.1)	(16.3)
Income before income taxes	67.8	42.8	168.0	144.6
Technical Solutions | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Customer Contracts for Healthcare Technology Management
Operating profit
Gain on sale of assets			7.7
Operating Segments
Revenues
Revenues	1,897.8	1,497.4	3,834.1	2,989.8
Operating Segments | Business & Industry
Revenues
Revenues	1,003.6	673.9	2,033.1	1,364.1
Operating profit
Operating profit	76.7	72.0	160.0	144.7
Operating Segments | Manufacturing & Distribution
Revenues
Revenues	356.9	340.3	716.0	681.0
Operating profit
Operating profit	41.9	40.1	82.5	79.8
Operating Segments | Education
Revenues
Revenues	204.4	212.8	410.1	420.8
Operating profit
Operating profit	11.7	13.8	24.3	35.5
Operating Segments | Aviation
Revenues
Revenues	185.9	145.9	386.1	286.8
Operating profit
Operating profit	9.6	5.7	18.5	8.8
Operating Segments | Technical Solutions
Revenues
Revenues	147.0	124.5	288.8	237.1
Operating profit
Operating profit	10.6	10.2	27.4	16.2
Operating Segments | Government Services
Operating profit
Operating profit	(0.3)	0.0	(0.3)	(0.1)
Corporate
Operating profit
Operating profit	(74.5)	(90.8)	(130.3)	(123.4)
Segment Reconciling Items
Operating profit
Income from unconsolidated affiliates	(0.6)	(0.2)	(1.0)	(0.8)
Adjustment for tax deductions for energy efficient government buildings, included in Technical Solutions	$ (0.2)	$ (0.4)	$ (0.2)	$ (0.6)