CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Income Statement [Abstract]
Revenues	$ 1,897.8	$ 1,497.4	$ 3,834.1	$ 2,989.8
Operating expenses	1,648.3	1,274.5	3,307.9	2,523.8
Selling, general and administrative expenses	156.8	161.9	309.9	284.5
Amortization of intangible assets	17.6	10.7	35.2	21.5
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
Income tax provision	(19.0)	(11.7)	(43.2)	(38.9)
Net income	48.8	31.1	124.8	105.7
Other comprehensive income (loss)
Interest rate swaps	11.3	1.6	11.9	2.8
Foreign currency translation and other	(8.9)	1.2	(11.4)	5.2
Income tax provision	(3.0)	(0.4)	(3.2)	(0.8)
Comprehensive income	$ 48.1	$ 33.4	$ 122.1	$ 112.9
Net income per common share
Basic (in USD per share)	$ 0.73	$ 0.46	$ 1.85	$ 1.57
Diluted (in USD per share)	$ 0.72	$ 0.46	$ 1.84	$ 1.56
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	67.2	67.3	67.5	67.2
Diluted (in shares)	67.5	67.8	67.9	67.7