Goodwill and Intangible Assets (Reconciliation of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 128.3		$ 128.9
Accumulated Amortization	(63.5)		(61.6)
Total	64.8		67.3
Amortization expense	2.1	$ 2.2
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	104.5		105.2
Accumulated Amortization	(51.4)		(50.0)
Total	53.1		55.2
Patents, trademarks and technology
Finite-Lived Intangible Assets
Gross Carrying Amount	23.8		23.7
Accumulated Amortization	(12.1)		(11.6)
Total	$ 11.7		$ 12.1