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Goodwill and Intangible Assets (Expected Amortization Expense Relating to Existing Intangible Assets) (Details) - USD ($)
$ in Millions
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity      
2023 $ 8.9    
2024 8.5    
2025 8.4    
2026 8.1    
2027 7.8    
Thereafter 58.1    
Total amortization expense $ 99.8 $ 61.6 $ 67.3