Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018		Apr. 30, 2017
Income Statement [Abstract]
Revenues	$ 1,580.8	$ 1,310.5	$ 3,169.2		$ 2,637.2
Operating expenses	1,405.8	1,164.6	2,835.1		2,359.7
Selling, general and administrative expenses	107.8	100.7	216.8		198.0
Restructuring and related expenses	5.3	5.8	19.6	[1]	10.8
Amortization of intangible assets	16.7	5.8	32.9		11.3
Impairment recovery	0.0	(17.4)	0.0		(17.4)
Operating profit	45.3	51.0	64.8		74.8
Income from unconsolidated affiliates, net	1.0	0.9	1.6		2.3
Interest expense	(13.8)	(3.0)	(28.1)		(6.3)
Income from continuing operations before income taxes	32.5	48.9	38.2		70.9
Income tax (provision) benefit	(7.1)	(17.3)	15.1		(23.2)
Income from continuing operations	25.4	31.6	53.3		47.7
Income (loss) from discontinued operations, net of taxes	1.2	(0.4)	1.1		(73.2)
Net income (loss)	26.6	31.3	54.4		(25.5)
Other comprehensive income (loss)
Change in fair value of interest rate swaps	4.6	0.0	23.2		2.6
Foreign currency translation	(4.5)	3.0	5.0		6.3
Income tax provision	(1.2)	0.0	(6.3)		(1.1)
Comprehensive income (loss)	$ 25.5	$ 34.3	$ 76.3		$ (17.6)
Net income (loss) per common share — Basic
Income from continuing operations (in usd per share)	$ 0.38	$ 0.56	$ 0.81		$ 0.85
Loss from discontinued operations (in usd per share)	0.02	(0.01)	0.02		(1.31)
Net income (loss) (in usd per share)	0.40	0.56	0.83		(0.46)
Net income (loss) per common share — Diluted
Income from continuing operations (in usd per share)	0.38	0.56	0.80		0.84
Loss from discontinued operations (in usd per share)	0.02	(0.01)	0.02		(1.29)
Net income (loss) (in usd per share)	$ 0.40	$ 0.55	$ 0.82		$ (0.45)
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	66.0	56.0	66.0		56.0
Diluted (in shares)	66.2	56.5	66.3		56.6
Dividends declared per common share (in usd per share)	$ 0.175	$ 0.170	$ 0.350		$ 0.340

[1] We include these costs within corporate expenses.