Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Income Statement [Abstract]
Revenues	$ 6,498.6	$ 6,442.2	$ 5,453.6
Operating expenses	5,767.5	5,747.4	4,881.2
Selling, general and administrative expenses	452.9	438.0	436.6
Restructuring and related expenses	11.2	25.7	20.9
Amortization of intangible assets	58.5	66.0	31.6
Impairment loss (recovery)	0.0	26.5
Impairment loss (recovery)	0.0	26.5	(18.5)
Operating profit	208.3	138.6	101.9
Income from unconsolidated affiliates	3.0	3.2	4.2
Interest expense	(51.1)	(54.1)	(19.2)
Income from continuing operations before income taxes	160.2	87.7	86.9
Income tax (provision) benefit	(32.7)	8.2	(8.8)
Income from continuing operations	127.5	95.9	78.1
(Loss) income from discontinued operations, net of taxes	(0.1)	1.8	(74.3)
Net income	127.4	97.8	3.8
Other comprehensive income (loss)
Interest rate swaps and other	(22.4)	21.9	2.7
Foreign currency translation	1.6	(4.7)	9.7
Income tax benefit (provision)	5.9	(5.9)	(1.1)
Comprehensive income	$ 112.5	$ 109.0	$ 15.2
Net income per common share — Basic
Income from continuing operations (usd per share)	$ 1.92	$ 1.45	$ 1.35
Income (Loss) from discontinued operations (usd per share)	0	0.03	(1.29)
Net income (usd per share)	1.91	1.48	0.07
Net income per common share — Diluted
Income from continuing operations (usd per share)	1.91	1.45	1.34
Income (Loss) from discontinued operations (usd per share)	0	0.03	(1.27)
Net income (usd per share)	$ 1.90	$ 1.47	$ 0.07
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	66.6	66.1	57.7
Diluted (in shares)	66.9	66.4	58.3