Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Net periodic benefit costs:
Service cost	$ 2.2	$ 1.6
Interest cost	2.4	3.4
Expected return on assets	(5.8)	(6.5)
Prior service cost amortization	0.1	0.2
Actuarial loss amortization	2.2	1.6
Curtailment charge	0.8	0.0
Net periodic benefit costs	$ 1.9	$ 0.3