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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Oct. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate | 16.90% | 5.40% | 9.00% | 0.90% |
Unrecognized tax benefits | $ 56.8 |  | $ 56.8 |  | $ 49.7
Unrecognized tax benefits that could be settled during the next twelve months | $ 19.5 |  | $ 19.5 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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