CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Income Statement [Abstract]
Revenues	$ 1,984.0	$ 1,897.8	$ 3,975.3	$ 3,834.1
Operating expenses	1,715.2	1,648.3	3,465.0	3,307.9
Selling, general and administrative expenses	156.6	156.8	307.2	309.9
Amortization of intangible assets	19.5	17.6	39.0	35.2
Operating profit	92.7	75.0	164.1	181.0
Income from unconsolidated affiliates	0.6	0.6	1.7	1.0
Interest expense	(21.1)	(7.8)	(40.9)	(14.1)
Income before income taxes	72.3	67.8	125.0	168.0
Income tax provision	(20.4)	(19.0)	(34.5)	(43.2)
Net income	51.9	48.8	90.4	124.8
Other comprehensive income
Interest rate swaps	(2.5)	11.3	(15.6)	11.9
Foreign currency translation and other	2.3	(8.9)	12.8	(11.4)
Income tax benefit (provision)	0.7	(3.0)	4.3	(3.2)
Comprehensive income	$ 52.4	$ 48.1	$ 92.0	$ 122.1
Net income per common share
Basic (in USD per share)	$ 0.78	$ 0.73	$ 1.36	$ 1.85
Diluted (in USD per share)	$ 0.78	$ 0.72	$ 1.35	$ 1.84
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	66.4	67.2	66.4	67.5
Diluted (in shares)	66.7	67.5	66.7	67.9