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Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
investment
Aug. 22, 2025
Petition
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number of small refinery exemption petitions granted full and partial exemption | Petition     20  
Decrease in cost of materials and other $ 280.8      
Long-term debt gross 3,230.8     $ 2,816.4
Cash collateral 8.0     7.5
Tangible asset impairment charges 11.6 $ 8.6    
Number of impaired equity investments | investment   2    
Delek Logistics 2028 Notes | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt gross 400.0     400.0
Delek Logistics 2028 Notes | Senior Notes | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt 402.5     399.1
Delek Logistics 2029 Notes | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt gross 1,050.0     1,050.0
Delek Logistics 2029 Notes | Senior Notes | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt 1,095.5     1,086.9
Delek Logistics 2033 Notes | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt gross 700.0     $ 0.0
Delek Logistics 2033 Notes | Senior Notes | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt $ 713.2