Consolidated Statement of Shareowners' Equity - USD ($) $ in Millions		Total	Total attributable to Rockwell Automation, Inc.	Common Stock [Member]	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Common stock in treasury, at cost	Noncontrolling interests
Beginning of period at Sep. 30, 2020		$ 1,346.8	$ 1,027.8	$ 181.4	$ 1,830.7	$ 7,139.8	$ (1,614.2)	$ (6,509.9)	$ 319.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,344.3	1,358.1			1,358.1			(13.8)
Other comprehensive income (loss)		596.4	597.1				597.1		(0.7)
Common stock issued (including share-based compensation impact)		206.2	206.2		103.5			102.7
Share repurchases		(301.5)	(301.5)					(301.5)
Cash dividends declared	[1]	(497.5)	(497.5)			(497.5)
Change in noncontrolling interest		(0.6)	(0.6)		(0.6)				0.0
End of period at Sep. 30, 2021		2,694.1	2,389.6	181.4	1,933.6	8,000.4	(1,017.1)	(6,708.7)	304.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		919.1	932.2			932.2			(13.1)
Other comprehensive income (loss)		99.3	99.6				99.6		(0.3)
Common stock issued (including share-based compensation impact)		126.1	126.1		73.5			52.6
Share repurchases		(301.1)	(301.1)					(301.1)
Cash dividends declared	[1]	(520.8)	(520.8)			(520.8)
End of period at Sep. 30, 2022		3,016.7	2,725.6	181.4	2,007.1	8,411.8	(917.5)	(6,957.2)	291.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,278.0	1,387.4			1,387.4			(109.4)
Other comprehensive income (loss)		127.5	127.4				127.4		0.1
Common stock issued (including share-based compensation impact)		177.2	177.2		95.4			81.8
Share repurchases		(312.0)	(312.0)					(312.0)
Cash dividends declared	[1]	(544.0)	(544.0)			(544.0)
End of period at Sep. 30, 2023		$ 3,743.4	$ 3,561.6	$ 181.4	$ 2,102.5	$ 9,255.2	$ (790.1)	$ (7,187.4)	$ 181.8

[1] Cash dividends were $4.72 per share in 2023; $4.48 per share in 2022; and $4.28 per share in 2021.