Other Comprehensive Income Items (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
After-tax changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			$ 5.4	$ 35.6
Other comprehensive income (loss) items before reclassification			(48.3)	(4.3)
Amounts reclassified from accumulated other comprehensive income			2.5	7.4
Net current period other comprehensive income (loss)	3.5	10.1	(45.8)	3.1
Balance at the end of the period	(40.4)	38.7	(40.4)	38.7
Cumulative Translation Adjustment
After-tax changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			6.0	39.5
Other comprehensive income (loss) items before reclassification			(45.8)	0.7
Net current period other comprehensive income (loss)			(45.8)	0.7
Balance at the end of the period	(39.8)	40.2	(39.8)	40.2
Unrealized Gain (Loss) on Derivatives
After-tax changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(0.6)	(3.9)
Other comprehensive income (loss) items before reclassification			(2.5)	(5.0)
Amounts reclassified from accumulated other comprehensive income			2.5	7.4
Net current period other comprehensive income (loss)				2.4
Balance at the end of the period	$ (0.6)	$ (1.5)	$ (0.6)	$ (1.5)