Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Income Statement [Abstract]
Revenues	$ 1,270.1	$ 1,231.3	$ 2,559.5	$ 2,457.8
Expenses
Operating	1,139.2	1,103.4	2,300.4	2,211.9
Selling, general and administrative	94.1	93.3	196.9	180.7
Amortization of intangible assets	6.0	6.7	12.2	13.4
Total expenses	1,239.3	1,203.4	2,509.5	2,406.0
Operating profit	30.8	27.9	50.0	51.8
Income from unconsolidated affiliates, net	2.2	1.2	3.7	2.7
Interest expense	(2.5)	(2.7)	(5.2)	(5.4)
Income before income taxes	30.5	26.4	48.5	49.1
Provision for income taxes	(12.2)	(11.2)	(12.5)	(20.8)
Net income	18.3	15.2	36.0	28.3
Other comprehensive income:
Foreign currency translation	1.2	0.2	(1.7)	0
Other Comprehensive Income Loss Other Adjustment After Tax	0	(0.3)	0	(0.3)
Comprehensive income	$ 19.5	$ 15.1	$ 34.3	$ 28.0
Net income per common share
Basic (in usd per share)	$ 0.32	$ 0.27	$ 0.64	$ 0.51
Diluted (in usd per share)	$ 0.32	$ 0.27	$ 0.63	$ 0.50
Weighted-average common and common equivalent shares outstanding
Basic (in shares)	56.8	56.1	56.6	55.9
Diluted (in shares)	57.6	57.0	57.4	57.0
Dividends declared per common share (in usd per share)	$ 0.16	$ 0.155	$ 0.32	$ 0.310