Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Apr. 30, 2019	Oct. 31, 2018	Nov. 01, 2018	[1]	Nov. 01, 2017
Class of Stock [Line Items]
ASU 2016-16 adoption			$ (13.3)		$ 4.8
Foreign Currency Translation Adjustment [Roll Forward]
Foreign Currency Translation Adjustment, Beginning Balance	$ (412.2)	$ (353.7)
Foreign Currency Translation Adjustment, Gross change in value for the period	14.1	(58.5)
Foreign Currency Translation Adjustment, tax effect		0.0
Foreign Currency Translation Adjustment, Ending Balance	(398.1)	(412.2)
Minimum Pension Liability [Roll Forward]
Minimum Pension Liability, Beginning Balance	(18.5)	(21.6)
Minimum Pension Liability, Gross change in value for the period	0.0	11.0
Minimum Pension Liability, tax effect		(3.1)
Minimum Pension Liability, Ending Balance	(18.5)	(18.5)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Total, Beginning balance	(430.7)	(375.3)
Gross change in value for the period	14.1	(47.5)
Tax effect for the period		(3.1)
Total, Ending balance	$ (416.6)	$ (430.7)
Foreign Currency Translation Adjustment
Class of Stock [Line Items]
ASU 2016-16 adoption					0.0
Minimum Pension Liability
Class of Stock [Line Items]
ASU 2016-16 adoption					$ 4.8

[1] We adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory in the first quarter of fiscal 2019. Refer to “Note 1. General" for further information.