Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 398.7	$ 294.8	$ 1,072.3	$ 583.1
Other comprehensive income (loss)
Pension and other postretirement benefit plan adjustments (net of tax (expense) benefit of $(12.8), $22.3, $(22.6), and $(49.6))	41.3	(72.9)	72.0	131.4
Currency translation adjustments	35.5	(62.0)	146.6	(91.3)
Net change in cash flow hedges (net of tax benefit (expense) of $2.1, $(4.0), $10.6, and $(7.2))	(5.7)	10.3	(26.5)	19.6
Other comprehensive income (loss)	71.1	(124.6)	192.1	59.7
Comprehensive income	469.8	170.2	1,264.4	642.8
Comprehensive loss attributable to noncontrolling interests	(1.0)	(3.3)	(12.1)	(10.1)
Comprehensive income attributable to Rockwell Automation, Inc.	$ 470.8	$ 173.5	$ 1,276.5	$ 652.9