Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Income Statement [Abstract]
Revenues	$ 6,228.6	$ 5,987.6	$ 6,498.6
Operating expenses	5,258.2	5,157.0	5,767.5
Selling, general and administrative expenses	719.2	506.1	452.9
Restructuring and related expenses	0.0	7.6	11.2
Amortization of intangible assets	45.0	48.4	58.5
Impairment loss of goodwill and other intangibles	0.0	172.8	0.0
Operating profit	206.3	95.7	208.3
Income from unconsolidated affiliates	2.1	2.2	3.0
Interest expense	(28.6)	(44.6)	(51.1)
Income from continuing operations before income taxes	179.8	53.3	160.2
Income tax provision	(53.5)	(53.1)	(32.7)
Income from continuing operations	126.3	0.2	127.5
Income (loss) from discontinued operations, net of taxes	0.0	0.1	(0.1)
Net income	126.3	0.3	127.4
Other comprehensive income (loss)
Interest rate swaps	4.5	(7.6)	(22.4)
Foreign currency translation and other	5.3	(1.8)	1.6
Income tax (provision) benefit	(1.5)	2.4	5.9
Comprehensive income (loss)	$ 134.5	$ (6.6)	$ 112.5
Net income per common share — Basic
Income from continuing operations (in USD per share)	$ 1.87	$ 0.00	$ 1.92
Income from discontinued operations (in USD per share)	0	0	0
Net income (in USD per share)	1.87	0.00	1.91
Net income per common share — Diluted
Income from continuing operations (in USD per share)	1.86	0.00	1.91
Income from discontinued operations (in USD per share)	0	0	0
Net income (in USD per share)	$ 1.86	$ 0.00	$ 1.90
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	67.4	66.9	66.6
Diluted (in shares)	68.0	67.3	66.9