Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 212.7	$ 378.7
Other comprehensive income (loss)
Pension and other postretirement benefit plan adjustments (net of tax benefit of $0.0 and $0.4)	0.1	(0.4)
Currency translation adjustments	84.2	85.8
Net change in cash flow hedges (net of tax benefit of $9.0 and $8.9)	(23.9)	(21.1)
Other comprehensive income (loss)	60.4	64.3
Comprehensive income	273.1	443.0
Comprehensive loss attributable to noncontrolling interests	(2.4)	(5.3)
Comprehensive income attributable to Rockwell Automation, Inc.	$ 275.5	$ 448.3