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Financial Derivatives and Hedging - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Apr. 06, 2020
Jul. 31, 2020
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Pre-tax impact of loss on derivatives recognized in other comprehensive income (loss)     $ 17.1    
After tax impact of loss on derivatives recognized in other comprehensive income (loss)     13.0 $ 0.0 $ 0.0
Derivative loss expected to be realized in earnings over the next twelve months     $ 6.8    
Interest Rate Swap          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Interest rate swap contracts, contract term (or less) 7 years 7 years