CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 265.3	$ 294.9	$ 478.0	$ 673.6
Other comprehensive income (loss)
Pension and other postretirement benefit plan adjustments (net of tax benefit (expense) of $0.0, $(10.2), $0.0, and $(9.8))	0.6	31.1	0.7	30.7
Currency translation adjustments	(43.6)	25.3	40.6	111.1
Net change in cash flow hedges (net of tax (expense) benefit of $(4.2), $(0.4), $4.8, and $8.5)	10.7	0.3	(13.2)	(20.8)
Other comprehensive income (loss)	(32.3)	56.7	28.1	121.0
Comprehensive income	233.0	351.6	506.1	794.6
Comprehensive loss attributable to noncontrolling interests	(1.0)	(5.8)	(3.4)	(11.1)
Comprehensive income attributable to Rockwell Automation, Inc.	$ 234.0	$ 357.4	$ 509.5	$ 805.7