Other Comprehensive Income Items - Amounts Recorded in and Reclassifications out of (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Other comprehensive income (loss), before tax
Interest expense	$ (117.1)	$ (109.8)	$ (105.6)	$ (89.6)	$ (80.8)	$ (78.8)	$ (77.7)	$ (74.6)	$ (422.1)	$ (311.9)	$ (281.1)
Administrative and operating expenses									(466.9)	(374.7)	(410.6)
Total other comprehensive income (loss), before tax									(19.1)	(69.7)	(28.4)
Other comprehensive income (loss), tax (expense) credit
Total other comprehensive income (loss), tax (expense) credit									(1.6)	1.2	(1.8)
Other comprehensive income (loss), after tax
Other comprehensive income (loss), net of income taxes									(20.7)	(68.5)	(30.2)
Cumulative Translation Adjustment
Other comprehensive income (loss), before tax
Total other comprehensive income (loss), before tax									(23.7)	(66.4)	(33.5)
Other comprehensive income (loss), after tax
Other comprehensive income (loss), net of income taxes									(23.7)	(66.4)	(33.5)
Unrealized Gain (Loss) on Derivatives
Other comprehensive income (loss), before tax
Unrealized hedging gain (loss), before tax									(0.4)	(11.9)	(10.2)
Total other comprehensive income (loss), before tax									4.6	(3.3)	5.1
Other comprehensive income (loss), tax (expense) credit
Unrealized hedging gain (loss), tax (expense) credit									0.1	4.2	3.6
Total other comprehensive income (loss), tax (expense) credit									(1.6)	1.2	(1.8)
Other comprehensive income (loss), after tax
Unrealized hedging gain (loss), after tax									(0.3)	(7.7)	(6.6)
Other comprehensive income (loss), net of income taxes									3.0	(2.1)	3.3
Unrealized Gain (Loss) on Derivatives | Interest rate contracts | Reclassifications of realized gain (loss)
Other comprehensive income (loss), before tax
Interest expense									5.0	8.6	9.8
Other comprehensive income (loss), tax (expense) credit
Reclassification of realized (gain) loss, tax expense (credit)									(1.7)	(3.0)	(3.5)
Other comprehensive income (loss), after tax
Reclassification of realized (gain) loss, after tax									$ 3.3	$ 5.6	6.3
Unrealized Gain (Loss) on Derivatives | Foreign exchange contracts | Reclassifications of realized gain (loss)
Other comprehensive income (loss), before tax
Administrative and operating expenses											5.5
Other comprehensive income (loss), tax (expense) credit
Reclassification of realized (gain) loss, tax expense (credit)											(1.9)
Other comprehensive income (loss), after tax
Reclassification of realized (gain) loss, after tax											$ 3.6