Restructuring and Related Costs - Restructuring and Related Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 7.0
Costs Recognized	3.1	$ 3.8
Payments	(4.3)
Non-Cash Items	(2.3)
Balance, end of period	3.5
Employee severance
Restructuring Reserve [Roll Forward]
Balance, beginning of period	3.0
Costs Recognized	0.2
Payments	(1.0)
Non-Cash Items	0.0
Balance, end of period	2.2
Other project fees
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0.7
Costs Recognized	3.0
Payments	(2.6)
Non-Cash Items	(0.2)
Balance, end of period	1.0
Lease exit costs and asset impairment
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2.7
Costs Recognized	0.0
Payments	(0.2)
Non-Cash Items	(2.2)
Balance, end of period	0.4
External support fees
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0.5
Costs Recognized	0.0
Payments	(0.5)
Non-Cash Items	0.0
Balance, end of period	$ 0.0