Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Net periodic benefit cost
Settlement loss	$ 3.1	$ 2.9
Pension Plan
Net periodic benefit cost
Service cost	9.5	6.0	$ 8.1
Interest cost	13.5	16.4	14.8
Expected return on assets	(26.1)	(26.5)	(26.2)
Prior service cost and transition amortization	0.7	0.6	0.3
Actuarial loss amortization	6.5	4.4	4.6
Settlement loss	3.1	2.9	3.5
Net periodic benefit costs	7.2	3.8	5.1
Other changes recognized in other comprehensive (loss) income:
Net actuarial (loss) gain	(25.2)	(29.0)	7.2
Amortization of asset obligations	0.2	0.2	0.2
Amortization of prior service cost	0.6	0.4	0.1
Amortization of net actuarial loss	9.5	7.3	8.1
Total recognized in other comprehensive (loss) income	(14.9)	(21.1)	15.6
Total recognized in net periodic benefit costs and other comprehensive (loss) income	$ (22.1)	$ (24.9)	$ 10.5