Financial Derivatives and Hedging - Schedule of Fair Values of Derivative Instruments in Condensed Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - Interest Rate Swap - USD ($) $ in Millions	Jul. 31, 2021	Jul. 31, 2020
Derivatives, Fair Value [Line Items]
Interest rate swap contracts, assets, liabilities	$ 2.9	$ 17.1
Other current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts, assets, liabilities	0.1	0.6
Other non-current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts, assets, liabilities	$ 2.8	$ 16.5