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	Jul. 31, 2020	Oct. 31, 2019
Estimated Fair Value Of Financial Instruments [Line Items]
Assets	$ 5,593.8	$ 5,426.7
Held by special purpose entities
Estimated Fair Value Of Financial Instruments [Line Items]
Assets	51.3	51.9
Senior Notes due 2021 | Estimate of Fair Value Measurement
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	248.6	248.1
Senior Notes due 2027 | Estimate of Fair Value Measurement
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair value	$ 533.6	$ 537.9