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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, 2019 | Oct. 31, 2018
--- | --- | ---
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets held by special purpose entities | $ 50.9 | $ 50.9
Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets held by special purpose entities | 51.8 | 51.6
Senior Notes due 2019 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | 0.0 | 257.4
Senior Notes due 2021 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | 254.8 | 263.4
Senior Notes due 2027 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | $ 517.1 | $ 0.0

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