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Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended				9 Months Ended
	Aug. 11, 2021	Feb. 09, 2021	Aug. 07, 2020	Feb. 10, 2020	Jul. 31, 2021	Jan. 31, 2021	Jul. 31, 2020	Jan. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Subsequent Event [Line Items]
Dividends on common stock		$ 1.5	$ 1.5	$ 1.5					$ 1.5	$ 1.5
Dividends on common stock (in dollars per share)		$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03
Subsequent Event
Subsequent Event [Line Items]
Dividends on common stock	$ 1.5
Dividends on common stock (in dollars per share)	$ 0.03

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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- Definition

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+ References

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