Amount, excluding 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 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: 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 3: 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

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

Revenue Recognition - Disaggregation of Revenue by Operating Segment and Major Typles of Products or Services (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Sales	$ 1,642.3	$ 1,586.6
Products
Disaggregation of Revenue [Line Items]
Sales	1,126.0
Solutions & Services
Disaggregation of Revenue [Line Items]
Sales	516.3
Architecture & Software
Disaggregation of Revenue [Line Items]
Sales	753.1
Architecture & Software \| Products
Disaggregation of Revenue [Line Items]
Sales	753.1
Architecture & Software \| Solutions & Services
Disaggregation of Revenue [Line Items]
Sales	0.0
Control Products & Solutions
Disaggregation of Revenue [Line Items]
Sales	889.2
Control Products & Solutions \| Products
Disaggregation of Revenue [Line Items]
Sales	372.9
Control Products & Solutions \| Solutions & Services
Disaggregation of Revenue [Line Items]
Sales	$ 516.3