Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 947.3	$ 1,278.0	$ 919.1
Other comprehensive income (loss)
Pension and other postretirement benefit plan adjustments (net of tax benefit (expense) of $7.4, ($15.4), and ($76.0))	(23.8)	41.5	246.5
Currency translation adjustments	68.9	99.4	(185.4)
Net change in cash flow hedges (net of tax benefit (expense) of $11.2, $5.3, and $(14.3))	(27.1)	(13.4)	38.2
Other comprehensive income	18.0	127.5	99.3
Comprehensive income	965.3	1,405.5	1,018.4
Comprehensive loss attributable to noncontrolling interests	(4.9)	(109.3)	(13.4)
Comprehensive income attributable to Rockwell Automation, Inc.	$ 970.2	$ 1,514.8	$ 1,031.8