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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Board Member Consulting Agreement
Related Party Transaction [Line Items]
Cash paid for consulting fees	$ 0.2
Outstanding amounts payable for the consulting services	0.0		$ 0.0
Related Party | Total Energies S.E.
Related Party Transaction [Line Items]
Proceeds from related party	0.0	$ 0.0	0.0	$ 0.0
Related Party | SAFE S.p.A.
Related Party Transaction [Line Items]
Payable to related parties	0.3		0.3		$ 0.5
Related Party | Business Expenses Reimbursement | Total Energies S.E.
Related Party Transaction [Line Items]
Related party expense	0.3	0.2	0.5	0.4
Related Party | Business Expenses Reimbursement | SAFE S.p.A.
Related Party Transaction [Line Items]
Related party expense	1.9	0.4	2.8	0.8
Related Party | Business Expenses Reimbursement | TotalEnergies JV and bpJV
Related Party Transaction [Line Items]
Related party expense	0.6	0.1	0.7	0.1
Receivables from related party	0.9		0.9		0.3
Related Party | Management Fee for Services | TotalEnergies JV and bpJV
Related Party Transaction [Line Items]
Proceeds from related party	1.1	0.9	2.1	1.7
Receivables from related party	3.6		3.6		1.7
Related Party | Management Fee for Services & Business Expenses Reimbursement | TotalEnergies JV and bpJV
Related Party Transaction [Line Items]
Proceeds from related party	0.5	1.0	0.6	1.6
Related Party | Sharing of Environmental Credits | TotalEnergies JV and bpJV
Related Party Transaction [Line Items]
Related party expense	0.9	0.9	1.8	1.9
Payable to related parties	0.7		0.7		0.4
Related Party | Guaranty Agreement | TotalEnergies JV and bpJV
Related Party Transaction [Line Items]
Tax credit loss		38.3		38.3
Fee received		0.7		0.7
Equity Method Investees | Rimere
Related Party Transaction [Line Items]
Payable to related parties	0.0		0.0		0.0
Receivables from related party	$ 0.0		$ 0.0		$ 0.0
Equity Method Investees | Loan Commitment | Rimere
Related Party Transaction [Line Items]
Proceeds from related party		0.2		0.3
Amount provided for funding in certain equity method investee		$ 0.9		$ 2.4

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