Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Net periodic benefit costs:
Service cost	$ 2.0	$ 2.1
Interest cost	3.7	3.4
Expected return on assets	(6.5)	(6.6)
Prior service cost amortization	0.1	0.1
Actuarial loss amortization	1.2	1.8
Net periodic benefit costs	$ 0.5	$ 0.8