Long-Term Debt - Summary of Long Term Debt (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2025	Dec. 31, 2024	Jan. 16, 2025	Mar. 07, 2024	Jun. 27, 2023	Jan. 20, 2022
Summary of Long-term debt
Fixed interest rate		11.00%	11.00%
Effective interest rate		11.10%	11.10%
MRL Term Loan Credit Agreement			$ 73.7
MRL asset financing arrangements			368.1
Finance lease obligations, at various interest rates, interest and principal payments monthly through June 2028		$ 2.4	2.9
Less unamortized debt issuance costs	[1]	(32.9)	(14.4)
Less unamortized discounts		(1.9)	(2.3)
Total debt		2,337.3	2,100.2
Less current portion of long-term debt		231.8	35.5
Total long-term debt		2,105.5	2,064.7
Accumulated amortization, deferred debt issuance costs		$ 34.2	$ 31.6
Revolving credit facility
Summary of Long-term debt
Weighted average interest rate during period		6.70%	7.50%
Long-term line of credit		$ 208.4	$ 286.6
MRL Revolving Credit Agreement
Summary of Long-term debt
Weighted average interest rate during period		6.40%	7.30%
11.0% July 2026, Notes
Summary of Long-term debt
Borrowings under senior notes		$ 204.4	$ 354.4
8.125% Senior Notes due July 2027
Summary of Long-term debt
Fixed interest rate		8.125%	8.125%				8.125%
Effective interest rate		8.30%	8.30%
Borrowings under senior notes		$ 325.0	$ 325.0
9.75% July 2028, Notes
Summary of Long-term debt
Fixed interest rate		9.75%	9.75%			9.75%
Effective interest rate		10.20%	10.20%
Borrowings under senior notes		$ 325.0	$ 325.0
9.75% July 2028, Mirror Issuance Notes
Summary of Long-term debt
Fixed interest rate		9.75%		9.75%
Effective interest rate		11.30%
Borrowings under senior notes		$ 100.0
9.25% July 2029, Notes
Summary of Long-term debt
Fixed interest rate		9.25%	9.25%
Effective interest rate		9.40%	9.40%
Borrowings under senior notes		$ 200.0	$ 200.0
Borrowings under the DOE Loan
Summary of Long-term debt
Long-term line of credit		795.7
Shreveport terminal asset financing arrangement
Summary of Long-term debt
Asset financing arrangement		37.9	42.1
Montana terminal asset financing arrangement
Summary of Long-term debt
Asset financing arrangement		27.8	30.4
Montana refinery asset financing arrangement
Summary of Long-term debt
Asset financing arrangement		$ 145.5	$ 108.7
11.0% Senior Notes due April 2025
Summary of Long-term debt
Fixed interest rate					11.00%
9.25% Senior Secured First Lien Notes due 2029 (the "2029 Secured Notes")
Summary of Long-term debt
Fixed interest rate					9.25%

[1] Deferred debt issuance costs are being amortized by the effective interest rate method over the lives of the related debt instruments. These amounts are net of accumulated amortization of $34.2 million and $31.6 million at June 30, 2025 and December 31, 2024, respectively.