Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Net periodic benefit costs:
Service cost	$ 1.8	$ 1.5	$ 4.0	$ 3.1
Interest cost	2.5	3.4	4.9	6.8
Expected return on assets	(5.8)	(6.5)	(11.5)	(13.0)
Prior service cost amortization	0.1	0.2	0.2	0.3
Actuarial loss amortization	1.9	1.6	4.1	3.2
Curtailment charge	0.0	0.0	0.8	0.0
Net periodic benefit costs	$ 0.5	$ 0.2	$ 2.5	$ 0.4