Other Comprehensive Income Items - Amounts Recorded in and Reclassifications out of (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Other comprehensive income (loss), before tax
Interest expense	$ (109.8)	$ (78.8)	$ (305.0)	$ (231.1)
Total other comprehensive income (loss), before tax	(22.3)	(16.0)	(13.8)	(61.8)
Other comprehensive income (loss), tax (expense) credit
Total other comprehensive income (loss), tax (expense) credit		0.4	(0.5)	0.4
Other comprehensive income (loss), after tax
Other comprehensive income (loss), net of income taxes	(22.3)	(15.6)	(14.3)	(61.4)
Cumulative Translation Adjustment
Other comprehensive income (loss), before tax
Total other comprehensive income (loss), before tax	(22.3)	(14.9)	(15.3)	(60.7)
Other comprehensive income (loss), after tax
Unrealized hedging gain (loss), after tax			(15.3)	(60.7)
Other comprehensive income (loss), net of income taxes	(22.3)	(14.9)	(15.3)	(60.7)
Unrealized Gain (Loss) on Derivatives
Other comprehensive income (loss), before tax
Unrealized hedging gain (loss), before tax	(1.1)	(3.5)	(2.8)	(7.4)
Total other comprehensive income (loss), before tax		(1.1)	1.5	(1.1)
Other comprehensive income (loss), tax (expense) credit
Unrealized hedging gain (loss), tax (expense) credit	0.4	1.2	1.0	2.6
Total other comprehensive income (loss), tax (expense) credit		0.4	(0.5)	0.4
Other comprehensive income (loss), after tax
Unrealized hedging gain (loss), after tax	(0.7)	(2.3)	(1.8)	(4.8)
Reclassification of realized (gain) loss, after tax			2.8	4.1
Other comprehensive income (loss), net of income taxes		(0.7)	1.0	(0.7)
Unrealized Gain (Loss) on Derivatives | Interest rate contracts | Reclassifications of realized gain (loss)
Other comprehensive income (loss), before tax
Interest expense	1.1	2.4	4.3	6.3
Other comprehensive income (loss), tax (expense) credit
Reclassification of realized (gain) loss, tax expense (credit)	(0.4)	(0.8)	(1.5)	(2.2)
Other comprehensive income (loss), after tax
Reclassification of realized (gain) loss, after tax	$ 0.7	$ 1.6	$ 2.8	$ 4.1