Consolidated Statement of Shareowners' Equity - USD ($) $ in Millions		Total	Total attributable to Rockwell Automation, Inc.	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Common stock in treasury, at cost	Noncontrolling interests
Balance at beginning 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 (loss)		238.9	241.5			241.5			(2.6)
Other comprehensive income		4.9	4.9				4.9		0.0
Common stock issued (including share-based compensation impact)		48.5	48.5		19.4			29.1
Share repurchases		(49.4)	(49.4)					(49.4)
Cash dividends declared	[1]	(130.2)	(130.2)			(130.2)
Balance at end of period at Dec. 31, 2021		2,806.8	2,504.9	181.4	1,953.0	8,111.7	(1,012.2)	(6,729.0)	301.9
Balance at beginning 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 (loss)		378.7	384.0			384.0			(5.3)
Other comprehensive income		64.3	64.3				64.3		0.0
Common stock issued (including share-based compensation impact)		32.8	32.8		8.6			24.2
Share repurchases		(156.0)	(156.0)					(156.0)
Cash dividends declared	[1]	(135.9)	(135.9)			(135.9)
Balance at end of period at Dec. 31, 2022		$ 3,200.6	$ 2,914.8	$ 181.4	$ 2,015.7	$ 8,659.9	$ (853.2)	$ (7,089.0)	$ 285.8

[1] Cash dividends were $1.18 per share and $1.12 per share in the three months ended December 31, 2022 and 2021, respectively.