Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jan. 31, 2020	Oct. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,628.6
Gross change in value		$ (24.4)
Tax effect for the period		8.0
Gross change in value	16.7
Ending balance	3,730.9	3,307.8
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(403.2)
Gross change in value		9.0
Tax effect for the period		0.0
Gross change in value	16.7
Ending balance	(386.5)	(412.2)
Minimum Pension Liability
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(43.9)
Gross change in value		(33.4)
Tax effect for the period		8.0
Gross change in value	0.0
Ending balance	(43.9)	(18.5)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(447.1)
Ending balance	$ (430.4)	$ (430.7)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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