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Segment Information - Schedule of Financial Information for Reportable Segments (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Oct. 31, 2023
Segment Reporting [Abstract] |  |  |
Number of reportable segments | segment | 3 |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 3,660.0 | $ 3,699.0 |
Corporate-related costs | (7.0) | 1.0 |
Restructuring and impairment costs | (11.0) | (7.0) |
Purchase accounting amortization | (11.0) | (12.0) |
Restructuring related charges | 9.0 | (3.0) |
Depreciation | (72.0) | (69.0) |
Stock based compensation | (13.0) | (8.0) |
Earnings before interest and income taxes | 111.0 | 114.0 |
Net financing charges | (44.0) | (41.0) |
Other pension income (expense) | (2.0) | (9.0) |
Income before income taxes | 65.0 | 64.0 |
One-time divestiture related tax impact at an affiliate | 2.0 |  |
Gain on contract settlement | 3.0 | 1.0 |
Integration-related costs |  | 1.0 |
Net actuarial and settlement/curtailment (gain) loss | 0.0 | (8.0) |
Assets Held For Sale | Adient (Langfang) Seating Co., Ltd |  |  |
Segment Reporting Information [Line Items] |  |  |
Subsidiary, ownership percentage disposed |  |  | 100.00%
Restatement Adjustment |  |  |
Segment Reporting Information [Line Items] |  |  |
Stock based compensation | (5.0) |  |
Brazil |  |  |
Segment Reporting Information [Line Items] |  |  |
One-time gain |  | 1.0 |
Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,647.0 | 1,724.0 |
Gain (loss) on disposition of property plant equipment | 10.0 |  |
Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Net actuarial and settlement/curtailment (gain) loss |  | 8.0 |
Operating Segments | Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,647.0 | 1,724.0 |
Adjusted EBITDA | 80.0 | 69.0 |
Operating Segments | EMEA |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,268.0 | 1,182.0 |
Adjusted EBITDA | 45.0 | 28.0 |
Operating Segments | Asia |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 770.0 | 821.0 |
Adjusted EBITDA | 114.0 | 138.0 |
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (25.0) | (28.0) |
Eliminations | Americas |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (493.0) | (531.0) |
Corporate-related costs |  |  |
Segment Reporting Information [Line Items] |  |  |
Corporate-related costs | $ (23.0) | $ (23.0) |

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