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Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenue (Narrative) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract assets	$ 12.3		$ 12.3
Contract liabilities	15.1		$ 15.1		$ 10.5
Description of performance obligation timing			Generally, these contracts have terms of one year or less
Increase in net sales and cost of sales	240.7	$ 239.8	$ 704.5	$ 683.0
Calculated under Revenue Guidance in Effect before Topic 606 \| Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in net sales and cost of sales	$ 3.6		$ 12.3