Other Comprehensive Income Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
After-tax changes in accumulated other comprehensive income (loss)
Balance			$ 3,805.1	$ 3,431.1
Net current period other comprehensive income (loss)	$ (15.6)	$ (0.3)	(61.4)	2.8
Balance	3,835.1	3,683.9	3,835.1	3,683.9
Accumulated Other Comprehensive Income (Loss)
After-tax changes in accumulated other comprehensive income (loss)
Balance			5.4	35.6
Other comprehensive income (loss) items before reclassification			(65.5)	(5.9)
Amounts reclassified from accumulated other comprehensive income			4.1	8.7
Net current period other comprehensive income (loss)			(61.4)	2.8
Balance	(56.0)	38.4	(56.0)	38.4
Cumulative Translation Adjustment
After-tax changes in accumulated other comprehensive income (loss)
Balance			6.0	39.5
Other comprehensive income (loss) items before reclassification			(60.7)	(1.4)
Net current period other comprehensive income (loss)	(14.9)	(2.1)	(60.7)	(1.4)
Balance	(54.7)	38.1	(54.7)	38.1
Unrealized Gain (Loss) on Derivatives
After-tax changes in accumulated other comprehensive income (loss)
Balance			(0.6)	(3.9)
Other comprehensive income (loss) items before reclassification	(2.3)	0.5	(4.8)	(4.5)
Amounts reclassified from accumulated other comprehensive income			4.1	8.7
Net current period other comprehensive income (loss)	(0.7)	1.8	(0.7)	4.2
Balance	$ (1.3)	$ 0.3	$ (1.3)	$ 0.3