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Debt and Other Obligations - Other Narrative (Details) emissions_certificate in Thousands, ¥ in Millions, ₩ in Billions	Jan. 21, 2026 EUR (€) emissions_certificate	Sep. 29, 2025 EUR (€) emissions_certificate	Sep. 16, 2025 EUR (€) emissions_certificate	Mar. 19, 2025 EUR (€) emissions_certificate	Dec. 31, 2025 USD ($)	Dec. 31, 2025 EUR (€)	Dec. 31, 2025 KRW (₩)	Dec. 31, 2025 CNY (¥)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 CNY (¥)	Oct. 31, 2023 EUR (€)	Sep. 30, 2023 EUR (€)	May 31, 2022 EUR (€)	Dec. 31, 2014 EUR (€)
Debt Instrument [Line Items]
Number of emission allowance certificates sold \| emissions_certificate		21	320	145
Proceeds from sale of emissions certificate		€ 1,600,000	€ 24,600,000	€ 10,500,000
Emissions certificates, repurchase obligation amount		€ 1,600,000	€ 24,800,000	€ 10,800,000
Amount outstanding, including accrued interest					$ 43,500,000	€ 37,000,000
Subsequent Event \| Counterparty One
Debt Instrument [Line Items]
Number of emission allowance certificates sold \| emissions_certificate	320
Proceeds from sale of emissions certificate	€ 27,100,000
Emissions certificates, repurchase obligation amount	€ 27,500,000
Subsequent Event \| Counterparty Two
Debt Instrument [Line Items]
Number of emission allowance certificates sold \| emissions_certificate	186
Proceeds from sale of emissions certificate	€ 15,800,000
Emissions certificates, repurchase obligation amount	€ 16,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity \| $					115,500,000
Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity					411,000,000	350,000,000			€ 350,000,000				€ 300,000,000	€ 350,000,000	€ 350,000,000	€ 115,000,000
Outstanding \| $					58,800,000					$ 0
Revolving Credit Facility \| RCF tranche
Debt Instrument [Line Items]
Borrowing capacity						116,000,000
Revolving Credit Facility \| Ancillary Credit Facilities
Debt Instrument [Line Items]
Borrowing capacity					275,000,000.0	€ 234,000,000				243,100,000	€ 234,000,000.0
Working Capital Loan \| South Korea
Debt Instrument [Line Items]
Borrowing capacity \| $					39,800,000
Working Capital Loan \| Korea Working Capital Loans \| South Korea
Debt Instrument [Line Items]
Borrowing capacity					36,400,000		₩ 52.5
Outstanding \| ₩							₩ 25.0
Working Capital Loan \| Committed \| South Korea
Debt Instrument [Line Items]
Outstanding \| $					17,300,000					22,700,000
Working Capital Loan \| China Working Capital Loans \| Qingdao
Debt Instrument [Line Items]
Borrowing capacity					7,100,000			¥ 50.0
Outstanding					7,100,000			50.0		6,800,000		¥ 49.2
Working Capital Loan \| China Working Capital Loans \| Huaibei
Debt Instrument [Line Items]
Borrowing capacity					10,300,000			71.8
Outstanding					$ 10,000,000.0			¥ 70.0		$ 4,900,000		¥ 36.0