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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Net periodic benefit costs    
Service cost $ 1.8 $ 2.2
Interest cost 2.5 2.4
Expected return on assets (6.3) (5.8)
Prior service cost amortization 0.1 0.1
Actuarial loss amortization 1.8 2.2
Curtailment charge 0.0 0.8
Net periodic pension (benefits) costs $ (0.1) $ 1.9