CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 231.1	$ 398.7	$ 709.1	$ 1,072.3
Other comprehensive income (loss)
Pension and other postretirement benefit plan adjustments (net of tax benefit (expense) of $0.0, $(12.8), $0.0, and $(22.6))	0.2	41.3	0.9	72.0
Currency translation adjustments	(31.6)	35.5	9.0	146.6
Net change in cash flow hedges (net of tax (expense) benefit of $(0.2), $2.1, $4.6, and $10.6)	0.1	(5.7)	(13.1)	(26.5)
Other comprehensive income (loss)	(31.3)	71.1	(3.2)	192.1
Comprehensive income	199.8	469.8	705.9	1,264.4
Comprehensive loss attributable to noncontrolling interests	(0.7)	(1.0)	(4.1)	(12.1)
Comprehensive income attributable to Rockwell Automation, Inc.	$ 200.5	$ 470.8	$ 710.0	$ 1,276.5