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Financial Instruments and Fair Value Measurements - Estimated Fair Values for the Company's Senior Notes and Assets Held by Special Purpose Entities (Details) - Estimate of Fair Value Measurement - USD ($) $ in Millions | Oct. 31, 2020 | Oct. 31, 2019
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Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets held by special purpose entities estimated fair value | $ 50.9 | $ 51.9
Senior Notes due 2021 |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value of debt instruments | 242.0 | 248.1
Senior Notes due 2027 |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value of debt instruments | $ 524.4 | $ 537.9

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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