Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Income Statement [Abstract]
Revenues	$ 1,257.1	$ 1,176.4	$ 2,525.5	$ 2,370.9
Expenses
Operating	1,132.4	1,052.6	2,278.7	2,125.6
Selling, general and administrative	97.5	90.6	192.4	189.3
Restructuring and related	8.8	0.0	16.0	0.0
Amortization of intangible assets	6.6	6.0	13.0	12.0
Total expenses	1,245.3	1,149.2	2,500.1	2,326.9
Operating profit	11.8	27.2	25.4	44.0
Income from unconsolidated affiliates, net	0.9	2.2	3.3	3.7
Interest expense	(2.4)	(2.5)	(5.1)	(5.2)
Income from continuing operations before income taxes	10.3	26.9	23.6	42.5
Income tax provision	(3.5)	(10.9)	(3.2)	(12.2)
Income from continuing operations	6.8	16.0	20.4	30.3
Net (loss) income from discontinued operations	(2.4)	2.3	(2.0)	5.7
Net income	4.4	18.3	18.4	36.0
Other comprehensive income (loss):
Foreign currency translation	4.1	1.2	(4.4)	(1.7)
Other	0.1	0.0	0.2	0.0
Comprehensive income	$ 8.6	$ 19.5	$ 14.2	$ 34.3
Net income per common share — Basic:
Income from continuing operations (in dollars per share)	$ 0.12	$ 0.28	$ 0.36	$ 0.54
(Loss) income from discontinued operations (in dollars per share)	(0.04)	0.04	(0.04)	0.10
Net income (in dollars per share)	0.08	0.32	0.32	0.64
Net income per common share — Diluted:
Income from continuing operations (in dollars per share)	0.12	0.28	0.36	0.53
(Loss) income from discontinued operations (in dollars per share)	(0.04)	0.04	(0.04)	0.10
Net income (in dollars per share)	$ 0.08	$ 0.32	$ 0.32	$ 0.63
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	56.4	56.8	56.5	56.6
Diluted (in shares)	56.9	57.6	57.0	57.4
Dividends declared per common share (in dollars per share)	$ 0.165	$ 0.160	$ 0.33	$ 0.32