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Shareowners' Equity - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (expense) income (Note 15) | $ (123.0) | $ 62.0 | $ (71.0)
Sales | 8,342.0 | 8,264.0 | 9,058.0
Cost of sales | (4,326.0) | (4,413.0) | (4,635.0)
Income before income taxes | 917.0 | 1,100.0 | 1,608.0
Income tax provision | (168.0) | (152.0) | (330.0)
Net income attributable to Rockwell Automation, Inc. | 869.0 | 953.0 | 1,387.0
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income attributable to Rockwell Automation, Inc. | 22.0 | (10.0) | 64.0
Amortization of net actuarial loss (gain) | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (expense) income (Note 15) | 29.0 | 0.0 | (2.0)
Settlement and curtailment charges | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (expense) income (Note 15) | 1.0 | 0.0 | 123.0
Pension and other postretirement benefit plan adjustments, net of tax | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income before income taxes | 30.0 | 0.0 | 121.0
Income tax provision | (7.0) | 0.0 | (31.0)
Net income attributable to Rockwell Automation, Inc. | 23.0 | 0.0 | 90.0
Accumulated gain (loss), net, cash flow hedge, parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Sales | 1.0 | (2.0) | (6.0)
Cost of sales | (7.0) | (19.0) | (33.0)
Interest expense | 4.0 | 4.0 | 4.0
Income before income taxes | (2.0) | (17.0) | (35.0)
Income tax provision | 1.0 | 5.0 | 9.0
Net income attributable to Rockwell Automation, Inc. | (1.0) | (12.0) | (26.0)
Accumulated currency translation adjustments, net of tax | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (expense) income (Note 15) | $ 0.0 | $ 2.0 | $ 0.0

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