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Segment Information - Schedule of Financial Information for Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |
Consolidated net sales | $ 3,644 | $ 3,495
Administrative, engineering and allocated costs | 130 | 125
Equity income | 27 | 25
Adjusted EBITDA | 229 | 218
Corporate-related costs | (22) | (22)
Restructuring and impairment costs | (24) | (23)
Purchase accounting amortization | (11) | (11)
Restructuring Related Charges | (7) | (1)
Gain (loss) on disposal transactions |  | 4
Depreciation expense | (69) | (69)
Equity based compensation | (8) | (5)
Other items | 2 | 2
Net financing charges | (48) | (45)
Other pension expense | (1) | (1)
Income (loss) before income taxes | 41 | 47
Restructuring charges | 23 | 9
Impairment of investment |  | 10
Gain on contract settlement | 2 | 2
2025 Restructuring Plan And Past Plans |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges |  | 13
2026 Restructuring Plan And Past Plans |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 24 |
Restructured Facility |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 5 | 6
Gain on disposition of property plant equipment |  | 5
Nonconsolidated Investees |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 2 |
Nonconsolidated Investees | Restructured Facility |  |
Segment Reporting Information [Line Items] |  |
Restructuring charges | 2 |
Setex, Inc. |  |
Segment Reporting Information [Line Items] |  |
Gain on sale | 4 | 4
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 3,666 | 3,512
Operating Segments | Americas |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 1,642 | 1,611
Material costs | 1,041 | 1,033
Labor and overhead | 482 | 444
Administrative, engineering and allocated costs | 39 | 49
Equity income | 0 | 0
Adjusted EBITDA | 80 | 85
Operating Segments | EMEA |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 1,205 | 1,129
Material costs | 742 | 712
Labor and overhead | 381 | 353
Administrative, engineering and allocated costs | 53 | 47
Equity income | 5 | 5
Adjusted EBITDA | 34 | 22
Operating Segments | Asia |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | 819 | 772
Material costs | 581 | 539
Labor and overhead | 115 | 105
Administrative, engineering and allocated costs | 32 | 33
Equity income | 24 | 16
Adjusted EBITDA | 115 | 111
Inter-segment elimination |  |
Segment Reporting Information [Line Items] |  |
Consolidated net sales | $ (22) | $ (17)

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