Revenue Recognition - Disaggregation of Revenue by Operating Segment and by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 1,565.3	$ 1,684.5
North America
Disaggregation of Revenue [Line Items]
Sales	912.3	1,006.9
Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	320.7	310.1
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	221.9	229.6
Latin America
Disaggregation of Revenue [Line Items]
Sales	110.4	137.9
Intelligent Devices
Disaggregation of Revenue [Line Items]
Sales	721.7	776.6
Intelligent Devices | North America
Disaggregation of Revenue [Line Items]
Sales	449.3	486.7
Intelligent Devices | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	130.3	127.8
Intelligent Devices | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	91.8	97.4
Intelligent Devices | Latin America
Disaggregation of Revenue [Line Items]
Sales	50.3	64.7
Software & Control
Disaggregation of Revenue [Line Items]
Sales	441.0	452.5
Software & Control | North America
Disaggregation of Revenue [Line Items]
Sales	266.4	279.8
Software & Control | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	84.8	74.1
Software & Control | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	62.6	67.0
Software & Control | Latin America
Disaggregation of Revenue [Line Items]
Sales	27.2	31.6
Lifecycle Services
Disaggregation of Revenue [Line Items]
Sales	402.6	455.4
Lifecycle Services | North America
Disaggregation of Revenue [Line Items]
Sales	196.6	240.4
Lifecycle Services | Europe, Middle East and Africa (EMEA)
Disaggregation of Revenue [Line Items]
Sales	105.6	108.2
Lifecycle Services | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales	67.5	65.2
Lifecycle Services | Latin America
Disaggregation of Revenue [Line Items]
Sales	$ 32.9	$ 41.6