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Debt and Other Obligations - Schedule of Other Short-Term Debt and Obligations (Details) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Repurchase Agreement | $ 43,000,000.0 |  | $ 36,500,000 |
Total of Other Short-term Debt and Obligations | 318,200,000 |  | 250,900,000 |
Revolving Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 58,700,000 |  | 0 |
Borrowing capacity | 410,900,000 | € 350,000,000 |  |
Revolving Credit Facility | Ancillary Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity | 274,700,000 | € 234,000,000.0 | 243,100,000 | € 234,000,000.0
Revolving Credit Facility | OEC GmbH outstanding borrowings | Ancillary Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 155,100,000 |  | 147,800,000 |
Revolving Credit Facility | OEC LLC outstanding borrowings | Ancillary Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 11,700,000 |  | 14,000,000.0 |
Revolving Credit Facility | OEC Huaibei outstanding borrowings | Ancillary Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 13,000,000.0 |  | 16,500,000 |
Working Capital Loan | Korea Working Capital Loans (capacity $51.7 million) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity | 51,700,000 |  |  |
Working Capital Loan | Korea Working Capital Loans (capacity $51.7 million) | Uncommitted |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 1,800,000 |  | 1,700,000 |
Working Capital Loan | Korea Working Capital Loans (capacity $51.7 million) | Committed |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 17,800,000 |  | 22,700,000 |
Working Capital Loan | China Working Capital Loans (capacity $17.1 million) | China Working Capital Loans (capacity $17.1 million) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding | 17,100,000 |  | $ 11,700,000 |
Borrowing capacity | $ 17,100,000 |  |  |

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