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Debt and Financing Arrangements - Narrative (Details) € in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2022 USD ($) | Aug. 30, 2024 USD ($) | Aug. 30, 2024 EUR (€) | Oct. 31, 2023 | Oct. 01, 2023 | Sep. 30, 2023 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred finance fee charges |  |  |  |  | $ 4,000,000 |  | $ 8,000,000 |  |  |  |  |
Total interest paid |  |  |  | $ 187,000,000 | $ 132,000,000 |  | 192,000,000 |  |  |  |  |
Proceeds from sale and collection of receivables |  |  |  | $ 170,000,000 |  |  |  |  |  |  |  |
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] |  |  |  | Accounts payable | Accounts payable |  |  |  |  |  |  | Accounts payable
Supplier finance program, obligation, current |  |  |  | $ 76,000,000 | $ 50,000,000 |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior long-term debt |  |  |  |  | 988,000,000 |  |  |  |  |  |  |
7.000 % Senior Secured Notes Due 2028 | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | 500,000,000 |  |  |  |  |  |  |
Proceeds from issuance of senior long-term debt |  |  |  |  | $ 494,000,000 |  |  |  |  |  |  |
Interest rate |  |  |  |  | 7.00% |  |  |  |  |  |  | 7.00%
8.250% Senior unsecured Notes Due 2031 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Proceeds from issuance of senior long-term debt |  |  |  |  | $ 494,000,000 |  |  |  |  |  |  |
Interest rate |  |  |  |  | 8.25% |  |  |  |  |  |  | 8.25%
3.50% Notes due in 2024 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  | $ 2,000,000 | € 2 |  |  |  |  |  |
Interest rate |  |  |  | 3.50% | 3.50% |  |  |  |  | 3.50% |  | 3.50%
Debt instrument, repurchased face amount |  |  |  |  | $ 743,000,000 |  |  |  |  |  |  | € 700
Long-term debt, gross |  |  |  | $ 0 | 130,000,000 |  |  | $ 132,000,000 | € 123 |  |  |
Debt Instrument, unamortized premium |  |  |  |  | 7,000,000 |  |  |  |  |  |  | 7
Interest payable |  |  |  |  | 3,000,000 |  |  |  |  |  |  | € 3
4.875% Notes due in 2026 | Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 795,000,000 | 795,000,000 |  |  |  |  |  |  |
Interest rate |  |  |  | 4.875% |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 795,000,000 | 795,000,000 |  |  |  |  |  |  |
Senior Notes due 2025, 9.00% | Senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |
Interest rate |  |  |  |  |  |  | 9.00% |  |  |  |  |
Debt Instrument, unamortized premium |  |  |  |  |  |  | $ 34,000,000 |  |  |  |  |
Interest payable |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Supplier finance program, payment period |  |  |  |  |  |  |  |  |  |  | 45 days |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Supplier finance program, payment period |  |  |  |  |  |  |  |  |  |  | 120 days |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 1,250,000,000 |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  | 7,000,000 |  |  |  |  |  |  |  |
Credit facility expansion (up to) |  |  |  | 250,000,000 |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  | $ 779,000,000 |  |  |  |  |  |  |  |
Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused portion of commitments (as percent) |  |  |  | 0.25% |  |  |  |  |  |  |  |
Basis spread |  |  |  | 1.50% |  |  |  |  |  |  |  |
Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused portion of commitments (as percent) |  |  |  | 0.375% |  |  |  |  |  |  |  |
Basis spread |  |  |  | 2.00% |  |  |  |  |  |  |  |
Revolving credit facility | North American |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  |
Revolving credit facility | European |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 300,000,000 |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 150,000,000 |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  | 11,000,000 |  |  |  |  |  |  |  |
Term loan | Term Loan B - LIBOR plus 3.25% due in 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, modification cost |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Debt issuance costs, gross |  |  |  | 4,000,000 |  |  |  |  |  |  |  |
Term loan | Term Loan B - LIBOR plus 3.25% due in 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread | 2.75% | 3.25% |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 632,000,000 |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  | 350,000,000 |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Debt instrument period percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |
First lien secured net leverage ratio |  |  |  | 1.75 |  |  |  |  |  |  |  |
Term loan | Incremental term loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |

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