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Long-Term Debt - Summary of Long Term Debt (Details) - CALUMET SPECIALTY PRODUCTS PARTNERS, L.P. - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Mar. 07, 2024
Jun. 27, 2023
Summary of Long-term debt        
MRL Term Loan Credit Agreement $ 74.1 $ 74.4    
Asset financing arrangement 46.9 50.8    
MRL asset financing arrangements 376.6 384.6    
Finance lease obligations, at various interest rates, interest and principal payments monthly through June 2028 2.5 3.0    
Less unamortized debt issuance costs [1] (16.6) (16.1)    
Less unamortized discounts (3.0) (3.5)    
Total debt 2,015.5 1,885.4    
Less current portion of long-term debt 390.4 55.7    
Total long-term debt 1,625.1 1,829.7    
Accumulated amortization, deferred debt issuance costs 29.0 26.6    
Revolving Credit Facility        
Summary of Long-term debt        
Long-term line of credit $ 315.1 $ 136.7    
Weighted average interest rate during period 7.70% 6.80%    
MRL Revolving Credit Agreement        
Summary of Long-term debt        
Borrowings under senior notes $ 6.4 $ 13.0    
Weighted average interest rate during period 7.30% 6.90%    
9.25% Senior Notes due July 2024        
Summary of Long-term debt        
Borrowings under senior notes   $ 179.0    
Fixed interest rate   9.25% 9.25%  
Effective interest rate   9.50%    
11.00% Senior Notes due 2025        
Summary of Long-term debt        
Borrowings under senior notes $ 363.5 $ 413.5    
Fixed interest rate 11.00% 11.00% 11.00%  
Effective interest rate 11.40% 11.40%    
8.125% Senior Notes due July 2027        
Summary of Long-term debt        
Borrowings under senior notes $ 325.0 $ 325.0    
Fixed interest rate 8.125% 8.125%    
Effective interest rate 8.30% 8.30%    
9.75% July 2028, Notes        
Summary of Long-term debt        
Borrowings under senior notes $ 325.0 $ 325.0    
Fixed interest rate 9.75%     9.75%
Effective interest rate 10.20%      
9.25% July 2029, Notes        
Summary of Long-term debt        
Borrowings under senior notes $ 200.0      
Fixed interest rate 9.25%      
Effective interest rate 9.40%      
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 $29.0 million and $26.6 million at June 30, 2024 and December 31, 2023, respectively.