Supplemental Information (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Supplemental Information (Unaudited)
Revenues	$ 443.7	$ 422.7	$ 413.3	$ 394.9	$ 413.8	$ 414.0	$ 399.3	$ 394.3	$ 1,674.6	$ 1,621.4	$ 1,682.3
Interest expense	101.7	109.2	125.4	119.3	115.2	111.2	120.5	132.4	455.6	479.3	533.6
Operating expenses	163.2	159.1	158.8	138.8	145.9	147.6	142.8	134.2	619.9	570.5	670.8
Provision for income taxes	66.7	56.0	51.1	44.0	59.7	54.9	50.4	44.2	217.8	209.2	159.4
Equity in income of unconsolidated affiliate	0.5	0.1	0.3	0.5	0.4	0.2	0.3	0.3	1.4	1.2	0.9
Net income attributable to the Company	$ 112.6	$ 98.5	$ 78.3	$ 93.3	$ 93.4	$ 100.5	$ 85.9	$ 83.8	$ 382.7	$ 363.6	$ 319.4