Consolidated Statement of Shareowners' Equity 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, 2018		$ 1,617.5	$ 1,617.5	$ 181.4	$ 1,681.4	$ 6,198.1	$ (941.9)	$ (5,501.5)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		80.3	80.3			80.3
Other comprehensive income (loss)		(35.0)	(35.0)				(35.0)
Common stock issued (including share-based compensation impact)		15.1	15.1		(7.0)			22.1
Share repurchases		(292.8)	(292.8)					(292.8)
Cash dividends declared	[1]	(116.9)	(116.9)			(116.9)
Balance at end of period at Dec. 31, 2018		1,274.3	1,274.3	181.4	1,674.4	6,167.6	(976.9)	(5,772.2)	0.0
Balance at beginning of period at Sep. 30, 2019		404.2	404.2	181.4	1,709.1	6,440.2	(1,488.0)	(6,438.5)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		315.4	310.7			310.7			4.7
Other comprehensive income (loss)		47.0	46.7				46.7		0.3
Common stock issued (including share-based compensation impact)		117.4	117.4		16.3			101.1
Share repurchases		(100.2)	(100.2)					(100.2)
Cash dividends declared	[1]	(117.9)	(117.9)			(117.9)
Change in noncontrolling interest		368.4	53.9		50.1		3.8		314.5
Balance at end of period at Dec. 31, 2019		$ 1,036.5	$ 717.0	$ 181.4	$ 1,775.5	$ 6,782.0	$ (1,584.3)	$ (6,437.6)	$ 319.5

[1] Cash dividends were $1.02 per share and $0.97 per share in the periods ending December 31, 2019 and 2018, respectively.