Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Net periodic benefit costs:
Service cost	$ 1.5	$ 1.5	$ 4.7	$ 4.5
Interest cost	3.3	4.1	10.1	12.3
Expected return on assets	(6.5)	(6.6)	(19.5)	(19.9)
Prior service cost amortization	0.2	0.1	0.5	0.4
Actuarial loss amortization	1.6	1.1	4.8	3.3
Settlement charge	2.3	0.0	2.3	0.0
Net periodic benefit costs	$ 2.4	$ 0.2	$ 2.9	$ 0.6