Goodwill and Other Intangible Assets (Reconciliation of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Ending balance, Net Intangible Assets	$ 35.6
Patents, Trademarks and Technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, Gross Carrying Amount	43.7	$ 38.1
Beginning balance, Accumulated Amortization	(33.9)	(30.3)
Beginning Balance, Net Intangible Assets	9.8	7.8
Intangibles acquired		4.6
Amortization expense	(1.7)	(2.3)
Foreign exchange translation, Gross Carrying Amount	0.0	1.0
Foreign exchange translation, Accumulated Amortization	0.2	(1.3)
Foreign exchange translation, Net Intangible Assets	0.2	(0.3)
Ending balance, Gross Carrying Amount	43.7	43.7
Ending balance, Accumulated Amortization	(35.4)	(33.9)
Ending balance, Net Intangible Assets	8.3	9.8
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, Gross Carrying Amount	62.9	58.7
Beginning balance, Accumulated Amortization	(32.1)	(28.0)
Beginning Balance, Net Intangible Assets	30.8	30.7
Intangibles acquired		4.0
Amortization expense	(3.9)	(4.1)
Foreign exchange translation, Gross Carrying Amount	0.1	0.2
Foreign exchange translation, Accumulated Amortization	0.3	0.0
Foreign exchange translation, Net Intangible Assets	0.4	0.2
Ending balance, Gross Carrying Amount	63.0	62.9
Ending balance, Accumulated Amortization	(35.7)	(32.1)
Ending balance, Net Intangible Assets	$ 27.3	$ 30.8