Goodwill and Intangible Assets (Reconciliation of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 126.9		$ 126.9		$ 123.8
Accumulated Amortization	(57.2)		(57.2)		(52.9)
Total	69.7		69.7		70.9
Amortization expense	2.0	$ 2.1	4.1	$ 3.5
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	104.0		104.0		101.5
Accumulated Amortization	(46.6)		(46.6)		(43.3)
Total	57.4		57.4		58.2
Patents, trademarks and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22.9		22.9		22.3
Accumulated Amortization	(10.6)		(10.6)		(9.6)
Total	$ 12.3		$ 12.3		$ 12.7