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Acquisitions - Final Allocation of Purchase Price (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 01, 2017
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 856.6 $ 857.8
Alon      
Business Acquisition [Line Items]      
Delek common stock issued (in shares) 19,250,795    
Ending price per share of Delek Common Stock immediately before the Effective Time (in dollars per share) $ 26.44    
Total value of common stock consideration $ 509.0    
Additional consideration 21.7    
Fair value of Delek's pre-existing equity method investment in Alon 449.0    
Consideration transferred 979.7    
Less: Fair value of net assets acquired 109.0    
Goodwill $ 870.7