Percentage of par value for issuance of debt.

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- Definition

Incremental Uncommitted Expansion Feature

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- Definition

Line of Credit Amendment

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- Definition

MRL asset financing arrangement

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MRL Revolving Credit Agreement, Maximum Borrowing Capacity

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MRL Revolving Credit Agreement , Maximum Borrowing Capacity, Optional Increase per request

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- Definition

Maximum amount of interest costs capitalized allowed.

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Number of tranches.

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- Definition

Amount of proceeds from sale and lease back transaction used for settlement of obligations during the period.

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The amount of cash outflow from sale of equipment in a sale and lease back transaction.

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The purchase price of the assets sold and leased back to the seller.

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The quarterly installments of borrowings payable in percentage of outstanding principal.

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The remaining purchase price of assets in sale and lease back transaction yet to disburse.

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Represents the percentage of cost of capital relating to rental payments made under sale and leaseback transaction.

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Amount of monthly rental payment to be made under the sale and leaseback transaction.

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Term for repurchasing the asset sold under sale and leaseback transaction in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Represents the amount of consideration for repurchasing the asset sold under sale and leaseback transaction.

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Term Loan Facility, Maximum Borrowing Capacity

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Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in YYYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value amount of debt instrument that was repurchased.

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No definition available.

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Indicates type of variable interest rate on debt instrument.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

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Long-Term Debt - Narrative (Details) $ in Millions																	3 Months Ended	9 Months Ended
Long-Term Debt - Narrative (Details) $ in Millions	Aug. 12, 2025 USD ($)	Jul. 25, 2025 USD ($)	May 24, 2025 USD ($)	Feb. 18, 2025 USD ($) item	Jan. 16, 2025 USD ($)	Jan. 10, 2025 USD ($)	Nov. 25, 2024 USD ($)	Sep. 30, 2024 USD ($)	Apr. 15, 2024 USD ($)	Mar. 07, 2024 USD ($)	Jan. 17, 2024 USD ($)	Jun. 28, 2023 USD ($)	Jun. 27, 2023 USD ($)	Apr. 19, 2023 USD ($)	Nov. 02, 2022 USD ($)	Jan. 20, 2022 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jan. 06, 2025 USD ($)	Dec. 31, 2024 USD ($)	Aug. 05, 2022 USD ($)
Debt Instruments
Fixed interest rate																	11.00%	11.00%			11.00%
Senior notes issued, gross																	$ 2,338.3	$ 2,338.3
Repayments of borrowings - senior notes																		$ 230.0	$ 229.0
Debt instrument, covenant compliance																		in compliance with all covenants under the indentures governing the Senior Notes
Line of credit facility, remaining borrowing capacity																	209.8	$ 209.8
Debt extinguishment costs																	0.5	(47.2)	(0.3)
MRL asset financing arrangements																					$ 368.1
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]														us-gaap:SecuredOvernightFinancingRateSofrMember
Capitalized accrued interest																	23.7	23.7
Maximum amount of capitalized accrued interest allowed																	$ 232.8	232.8
Payment to purchase equipment																		$ 39.6	$ 51.7
Calumet Shreveport Refining, LLC
Debt Instruments
Purchase price of assets sold and leased back		$ 120.0
Lease agreement term		7 years
Monthly rent		$ 1.8
Cost of capital (in %)		10.75%
Repurchase term		6 years
Repurchase price		$ 42.0
Settlement of outstanding obligation		$ 40.0
US Government Agency Insured Loans \| US Department of Energy facility
Debt Instruments
Proceeds from agreement				$ 658.0
Guarantor obligations, maximum exposure						$ 1,440.0
Number of tranches \| item				2
US Government Agency Insured Loans \| US Department of Energy facility \| Tranche One
Debt Instruments
Proceeds from agreement				$ 781.8
9.25% Senior Secured First Lien Notes due 2029 (the "2029 Secured Notes")
Debt Instruments
Fixed interest rate										9.25%
Senior notes, issuance date										Mar. 07, 2024
Senior notes issued, gross										$ 200.0
Proceeds from debt										$ 199.0
Debt instrument, repurchase amount													$ 200.0
9.75% July 2028, Notes
Debt Instruments
Fixed interest rate													9.75%				9.75%	9.75%			9.75%
Senior notes, issuance date													Jun. 27, 2023
Senior notes issued, gross													$ 325.0
Proceeds from debt													319.1
Proceeds used for repurchase of debt												$ 125.5
8.125% Senior Notes due July 2027
Debt Instruments
Fixed interest rate																8.125%	8.125%	8.125%			8.125%
Senior notes, issuance date																Jan. 20, 2022
Senior notes issued, gross																$ 325.0
11.00% Senior Notes due 2026
Debt Instruments
Fixed interest rate							11.00%
Senior notes, issuance date	Aug. 12, 2025		May 24, 2025
Repayments of borrowings - senior notes	$ 80.0		$ 150.0
11.0% Senior Notes due April 2025
Debt Instruments
Fixed interest rate										11.00%
Senior notes, issuance date							Nov. 25, 2024
Senior notes issued, gross							$ 354.4
Proceeds used for repurchase of debt										$ 50.0
Debt instrument, repurchase amount												100.0	$ 100.0
11.0% July 2026, Notes
Debt Instruments
Senior notes issued, gross							$ 354.4
9.25% Senior Notes due July 2024
Debt Instruments
Fixed interest rate										9.25%
Revolving credit facility
Debt Instruments
Senior secured revolving credit facility																				$ 170.0
Debt instrument, covenant compliance																		in compliance with all covenants under the revolving credit facility.
Line of credit amendment											Jan. 17, 2024
Line of credit facility, covenant terms																		if the Company’s availability to borrow loans under the revolving credit facility falls below the sum of (a) the greater of (i) (x) 15% of the borrowing base then in effect at the same time that the refinery asset borrowing base component is greater than $0 and (y) 10% of the borrowing base then in effect at any time that the refinery asset borrowing base component is equal to $0 and (ii) $45.0 million (which amount is subject to certain increases) plus (b) the amount of FILO Loans outstanding, then the Company will be required to maintain as of the end of each fiscal quarter a Fixed Charge Coverage Ratio (as defined in the Credit Agreement) of at least 1.0 to 1.0.
Letters of credit outstanding, amount																	$ 71.4	$ 71.4
Line of credit facility, current borrowing capacity																	448.8	448.8
Long-term line of credit																	167.6	167.6			$ 286.6
Incremental Uncommitted Expansion Feature											$ 500.0
Term Loan Facility, Maximum Borrowing Capacity											$ 650.0
MRL Asset #2
Debt Instruments
MRL asset financing arrangements																						$ 250.0
MRL Asset #3
Debt Instruments
MRL asset financing arrangements																						100.0
MRL Asset #4
Debt Instruments
Debt extinguishment costs																		34.8
MRL asset financing arrangements																						$ 50.0
MRL Revolving Credit Agreement
Debt Instruments
Senior notes, issuance date															Nov. 02, 2022
Proceeds used for repurchase of debt						26.7
Debt extinguishment costs																		0.3
MRL revolving credit agreement , maximum borrowing capacity, optional Increase per request															$ 15.0
MRL revolving credit agreement, maximum borrowing capacity															$ 90.0
2025 Notes
Debt Instruments
Proceeds used for repurchase of debt									$ 50.0
Debt instrument, repurchase amount												$ 21.0
MRL Term Loan Credit Agreement
Debt Instruments
Senior notes, issuance date														Apr. 19, 2023
Repayments of borrowings - senior notes						0.7
Proceeds used for repurchase of debt						83.8
Debt extinguishment costs																		12.3
Quarterly installments of borrowings payable in percentage of outstanding principal														0.25%
Face amount						9.4								$ 75.0
MRL Term Loan Credit Agreement \| Minimum
Debt Instruments
Debt instrument, basis spread on variable rate														6.00%
MRL Term Loan Credit Agreement \| Maximum
Debt Instruments
Debt instrument, basis spread on variable rate														7.30%
Montana refinery asset financing arrangement
Debt Instruments
Purchase price of assets sold and leased back																	$ 150.0	$ 150.0
Remaining purchase price				40.0
Total purchase price				40.0				$ 110.0
Montana refinery asset financing arrangement \| US Government Agency Insured Loans \| US Department of Energy facility \| Tranche One
Debt Instruments
Proceeds from agreement				$ 781.8
9.75% July 2028, Mirror Issuance Notes
Debt Instruments
Fixed interest rate					9.75%												9.75%	9.75%
Senior notes, issuance date					Jan. 16, 2025
Senior notes issued, gross					$ 100.0
Proceeds from debt					$ 96.0
Percentage of par value for issuance of debt					98.00%
MRL Supply And Offtake Agreement
Debt Instruments
Proceeds used for repurchase of debt						32.5
Payment to purchase equipment						392.2
Exit fees						$ 23.0