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Debt and Other Obligations - Other Short-Term Debt and Obligations (Details) € in Millions, $ in Millions	Mar. 31, 2024 USD ($)	Mar. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Debt Instrument [Line Items]
Total of Other Short-term Debt and Obligations	$ 142.6		$ 134.7
Revolving Credit Facility \| Ancillary Credit Facilities
Debt Instrument [Line Items]
Borrowing capacity	253.0	€ 234.0	236.5	€ 214.0
Revolving Credit Facility \| OEC GmbH outstanding borrowings \| Ancillary Credit Facilities
Debt Instrument [Line Items]
Outstanding	119.9		88.8
Revolving Credit Facility \| OEC LLC outstanding borrowings \| Ancillary Credit Facilities
Debt Instrument [Line Items]
Outstanding	5.8		21.1
Line of Credit \| Brazil Uncommitted Local Lines of Credit (capacity $3.2 million)
Debt Instrument [Line Items]
Outstanding	0.0		0.0
Borrowing capacity	3.2
Working Capital Loan \| Korea Working Capital Loan (capacity $38.9 million)
Debt Instrument [Line Items]
Borrowing capacity	38.9
Working Capital Loan \| Korea Working Capital Loan (capacity $38.9 million) \| Uncommitted
Debt Instrument [Line Items]
Outstanding	1.9		1.9
Working Capital Loan \| Korea Working Capital Loan (capacity $38.9 million) \| Committed
Debt Instrument [Line Items]
Outstanding	15.0		20.1
Working Capital Loan \| China Working Capital Loan
Debt Instrument [Line Items]
Outstanding	$ 0.0		$ 2.8