Supplemental Information (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Supplemental Information (Unaudited)
Revenues	$ 506.5	$ 493.4	$ 475.0	$ 476.8	$ 521.9	$ 487.6	$ 454.5	$ 431.8	$ 1,951.7	$ 1,895.8	$ 1,767.5
Interest expense	80.8	78.8	77.7	74.6	74.6	69.0	63.4	74.1	311.9	281.1	352.2
Operating expenses	239.8	216.7	214.1	202.3	213.5	218.1	196.7	183.5	872.9	811.8	689.5
Provision for income taxes	64.4	71.1	67.7	66.7	79.9	71.6	70.6	38.5	269.9	260.6	258.4
Equity in income of unconsolidated affiliate	0.3	0.1	0.4	0.4	0.3	0.3	0.5	0.8	1.2	1.9	1.1
Net income attributable to the Company	$ 121.8	$ 126.9	$ 115.9	$ 133.6	$ 154.2	$ 129.2	$ 124.3	$ 136.5	$ 498.2	$ 544.2	$ 468.5