Revenue Recognition - Disaggregation of Revenue by Operating Segment and by Geographic Region (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
North America
Disaggregation of Revenue [Line Items]
Sales	998.8
Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	294.4
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	214.4
Latin America
Disaggregation of Revenue [Line Items]
Sales	134.7
Architecture & Software
Disaggregation of Revenue [Line Items]
Sales	753.1
Architecture & Software | North America
Disaggregation of Revenue [Line Items]
Sales	442.8
Architecture & Software | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	155.5
Architecture & Software | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	101.3
Architecture & Software | Latin America
Disaggregation of Revenue [Line Items]
Sales	53.5
Control Products & Solutions
Disaggregation of Revenue [Line Items]
Sales	889.2
Control Products & Solutions | North America
Disaggregation of Revenue [Line Items]
Sales	556.0
Control Products & Solutions | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	138.9
Control Products & Solutions | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	113.1
Control Products & Solutions | Latin America
Disaggregation of Revenue [Line Items]
Sales	$ 81.2