Revenue Recognition - Disaggregation of Revenue by Operating Segment and by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 1,684.5	$ 1,642.3
North America
Disaggregation of Revenue [Line Items]
Sales	1,006.9	998.8
Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	310.1	294.4
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	229.6	214.4
Latin America
Disaggregation of Revenue [Line Items]
Sales	137.9	134.7
Architecture & Software
Disaggregation of Revenue [Line Items]
Sales	751.6	753.1
Architecture & Software | North America
Disaggregation of Revenue [Line Items]
Sales	440.2	442.8
Architecture & Software | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	148.1	155.5
Architecture & Software | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	112.2	101.3
Architecture & Software | Latin America
Disaggregation of Revenue [Line Items]
Sales	51.1	53.5
Control Products & Solutions
Disaggregation of Revenue [Line Items]
Sales	932.9	889.2
Control Products & Solutions | North America
Disaggregation of Revenue [Line Items]
Sales	566.7	556.0
Control Products & Solutions | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	162.0	138.9
Control Products & Solutions | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	117.4	113.1
Control Products & Solutions | Latin America
Disaggregation of Revenue [Line Items]
Sales	$ 86.8	$ 81.2