Revenue (Disaggregation of Revenue by Geographical Area) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 703.7	$ 664.7	$ 1,405.1	$ 1,309.5
United States
Disaggregation of Revenue [Line Items]
Total net sales	289.4	272.3	594.5	546.7
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total net sales	207.4	192.0	403.7	376.8
Asia Pacific
Disaggregation of Revenue [Line Items]
Total net sales	149.3	148.0	296.6	280.1
Latin America
Disaggregation of Revenue [Line Items]
Total net sales	$ 57.6	$ 52.4	$ 110.3	$ 105.9

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration