Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Statement [Abstract]
Revenues	$ 1,348.8	$ 1,276.1	$ 3,908.3	$ 3,733.9
Expenses
Operating	1,251.0	1,144.7	3,551.4	3,356.6
Selling, general and administrative	98.8	91.2	295.7	271.9
Amortization of intangible assets	6.3	6.5	18.5	19.9
Total expenses	1,356.1	1,242.4	3,865.6	3,648.4
Operating (loss) profit	(7.3)	33.7	42.7	85.5
Income from unconsolidated affiliates, net	2.6	1.6	6.3	4.3
Interest expense	(2.4)	(2.7)	(7.6)	(8.1)
(Loss) income before income taxes	(7.1)	32.6	41.4	81.7
Benefit (provision) for income taxes	8.6	(13.2)	(3.9)	(34.0)
Net income	1.5	19.4	37.5	47.7
Other comprehensive income:
Foreign currency translation	0.1	0.0	(1.6)	0.0
Other	0.1	0.5	0.1	0.2
Comprehensive income	$ 1.7	$ 19.9	$ 36.0	$ 47.9
Net income per common share
Basic (in usd per share)	$ 0.03	$ 0.34	$ 0.66	$ 0.85
Diluted (in usd per share)	$ 0.03	$ 0.34	$ 0.65	$ 0.84
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	56.8	56.2	56.7	56.0
Diluted (in shares)	57.5	57.0	57.4	57.0
Dividends declared per common share (in usd per share)	$ 0.160	$ 0.155	$ 0.480	$ 0.465