Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Income Statement [Abstract]
Revenues	$ 1,492.4	$ 1,612.9
Operating expenses	1,249.4	1,433.7
Selling, general and administrative expenses	122.6	117.6
Restructuring and related expenses	0.0	3.1
Amortization of intangible assets	10.8	12.6
Operating profit	109.7	45.8
Income from unconsolidated affiliates	0.6	0.9
Interest expense	(8.5)	(10.2)
Income from continuing operations before income taxes	101.9	36.5
Income tax provision	(27.2)	(8.6)
Income from continuing operations	74.6	27.9
Income from discontinued operations, net of taxes	0.0	0.1
Net income	74.6	28.0
Other comprehensive income (loss)
Interest rate swaps	1.2	(1.1)
Foreign currency translation and other	4.0	0.4
Income tax (provision) benefit	(0.4)	0.3
Comprehensive income	$ 79.5	$ 27.6
Net income per common share — Basic
Income from continuing operations (in usd per share)	$ 1.11	$ 0.42
Income from discontinued operations (in usd per share)	0	0
Net income (in usd per share)	1.11	0.42
Net income per common share — Diluted
Income from continuing operations (in usd per share)	1.10	0.41
Income from discontinued operations (in usd per share)	0	0
Net income (in usd per share)	$ 1.10	$ 0.42
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	67.2	66.9
Diluted (in shares)	67.6	67.2