Employee Benefits (Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Net transition obligation	$ 0.0	$ 0.0	$ 0.0
Prior service cost	0.0	0.0	0.0
Net loss (gain)	(8.1)	15.4	11.5
Amortizations of net transition obligation	0.0	0.0	0.0
Amortizations of prior service cost	0.0	0.0	0.0
Amortizations of net (gain)	(2.7)	(1.7)	(1.5)
Total recognized in other comprehensive income	(10.8)	13.7	10.0
Total recognized in net periodic benefit cost and other comprehensive income	$ (0.8)	$ 22.0	$ 18.9