Post Retirement Benefit Plans - Changes in Accumulated Other Comprehensive (Income) or Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Defined Benefit Plan, Changes in Accumulated Other Comprehensive (Income) Loss [Roll Forward]
Accumulated other comprehensive loss at beginning of year	$ 199.8	$ 188.6
Increase or (decrease) in accumulated other comprehensive (income) or loss
Net prior service costs amortized during fiscal year	0.1	0.2
Net loss amortized during fiscal year	(10.9)	(11.4)
Loss recognized during fiscal year due to settlement	(27.8)	(0.1)
Prior service credit occurring during fiscal year	(0.2)	0.5
Liability loss occurring during fiscal year	13.2	69.8
Asset gain occurring during fiscal year	(10.5)	(39.4)
Increase (decrease) in accumulated other comprehensive loss	(36.1)	19.6
Foreign currency impact	4.4	(8.4)
Accumulated other comprehensive loss at fiscal year end	$ 168.1	$ 199.8