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 |