Financial Derivatives and Hedging - Schedule of Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
AOCI Attributable To Parent, Before Reclassification And Tax [Roll Forward]
Beginning balance	$ 6,926.1	$ 5,989.9	$ 6,942.0	$ 3,824.8
Amount recognized in other comprehensive income on interest rate swaps contracts, net of tax			50.2
Amount reclassified from other comprehensive income into earnings, net of tax			2.5
Ending balance	7,013.8	$ 6,162.8	7,013.8	6,162.8
Accumulated Gain (Loss), Net, Cash Flow Hedge, Before Tax, Parent
AOCI Attributable To Parent, Before Reclassification And Tax [Roll Forward]
Beginning balance			17.2
Ending balance	86.8		86.8
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Attributable To Parent, Before Reclassification And Tax [Roll Forward]
Beginning balance			13.1	$ (13.0)
Amount recognized in other comprehensive income on interest rate swap contracts, gross ($50.2 million, net of tax)			66.3
Amount reclassified from other comprehensive income into earnings, gross ($2.5 million, net of tax)			3.3
Ending balance	$ 65.8		$ 65.8