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Employee Benefit Plans (Changes in Fair Value of U.S. Pension Plans' Level 3 Assets) (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Change in fair value of plan assets      
Fair value of plan assets, beginning of year $ 550.6 $ 502.2  
Fair value of plan assets, end of year 591.3 550.6 $ 502.2
Level 3      
Change in fair value of plan assets      
Fair value of plan assets, beginning of year 35.4 30.8 28.6
Unrealized gains 3.6 4.1 3.5
Foreign currency exchange 0.1 2.1 (1.5)
Purchases 0.6 0.5 0.5
Sales (2.0) (2.1) (0.3)
Fair value of plan assets, end of year $ 37.7 $ 35.4 $ 30.8