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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) - USD ($) $ in Millions | Apr. 30, 2020 | Oct. 31, 2019
--- | --- | ---
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets | $ 5,529.0 | $ 5,426.7
Held by special purpose entities |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets | 51.7 | 51.9
Senior Notes due 2021 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | 229.5 | 248.1
Senior Notes due 2027 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | $ 504.4 | $ 537.9

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