Restructuring and Related Costs - Reconciliation Restructuring (Details) $ in Millions	9 Months Ended
	Jul. 31, 2016 USD ($)
Restructuring Reserve [Roll Forward]
Balance, at beginning of period	$ 6.6
Cost recognized	(19.3)
Payments	(20.4)
Balance, at end of period	5.5
External Support Fees
Restructuring Reserve [Roll Forward]
Balance, at beginning of period	2.1
Cost recognized	(9.8)
Payments	(11.5)
Balance, at end of period	0.4
Employee Severance
Restructuring Reserve [Roll Forward]
Balance, at beginning of period	4.3
Cost recognized	(7.2)
Payments	(7.0)
Balance, at end of period	4.6
Lease Exit and Other
Restructuring Reserve [Roll Forward]
Balance, at beginning of period	0.2
Cost recognized	(2.3)
Payments	(2.0)
Balance, at end of period	$ 0.5