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Business Segment Information - Schedule of Reportable Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |
Sales | $ 8,264.2 | $ 9,058.0 | $ 7,760.4
Sales and operating results of reportable segments |  |  |
Purchase accounting depreciation and amortization, and impairment | (143.9) | (264.4) | (103.9)
Corporate and other | (135.8) | (127.9) | (104.7)
Non-operating pension and postretirement benefit credit (cost) | 19.8 | (82.7) | (4.7)
Change in fair value of investments | 0.1 | 279.3 | (136.9)
Restructuring charges | (97.4) | 0.0 | 0.0
Interest expense, net | (139.0) | (125.6) | (118.8)
Income before income taxes | 1,099.1 | 1,608.5 | 1,073.6
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 8,264.2 | 9,058.0 | 7,760.4
Segment operating earnings | 1,595.3 | 1,929.8 | 1,542.6
Intelligent Devices |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 3,804.1 | 4,098.2 |
Intelligent Devices | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 3,804.1 | 4,098.2 | 3,544.6
Segment operating earnings | 700.0 | 828.2 | 717.6
Software & Control |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 2,187.4 | 2,886.0 |
Software & Control | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 2,187.4 | 2,886.0 | 2,312.9
Segment operating earnings | 529.7 | 953.2 | 666.7
Lifecycle Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 2,272.7 | 2,073.8 |
Lifecycle Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales | 2,272.7 | 2,073.8 | 1,902.9
Segment operating earnings | $ 365.6 | $ 148.4 | $ 158.3

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