CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Income Statement [Abstract]
Revenues	$ 2,028.2	$ 1,961.4	$ 6,003.5	$ 5,795.5
Operating expenses	1,765.8	1,696.4	5,230.7	5,004.4
Selling, general and administrative expenses	104.3	158.6	411.5	468.5
Amortization of intangible assets	19.2	17.7	58.2	52.9
Operating profit	138.9	88.7	303.1	269.7
Income from unconsolidated affiliates	1.2	0.8	3.0	1.8
Interest expense	(20.9)	(11.1)	(61.8)	(25.2)
Income before income taxes	119.3	78.3	244.2	246.3
Income tax provision	(21.2)	(21.5)	(55.7)	(64.8)
Net income	98.1	56.8	188.5	181.6
Other comprehensive income
Interest rate swaps	12.8	(5.7)	(2.7)	6.2
Foreign currency translation and other	3.1	(3.7)	15.9	(15.1)
Income tax (provision) benefit	(3.6)	1.5	0.7	(1.7)
Comprehensive income	$ 110.4	$ 48.9	$ 202.4	$ 171.1
Net income per common share
Basic (in USD per share)	$ 1.48	$ 0.85	$ 2.84	$ 2.70
Diluted (in USD per share)	$ 1.47	$ 0.85	$ 2.83	$ 2.68
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	66.3	66.8	66.3	67.3
Diluted (in shares)	66.6	67.2	66.7	67.7