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Long-Term Obligations and Notes Payable - Promissory Notes Narrative (Details)
$ in Millions
May 14, 2015
USD ($)
Mar. 31, 2020
USD ($)
note_payable
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Number of Notes Payable | note_payable   4  
Outstanding borrowings   $ 2,216.9 $ 2,067.1
Loans payable | Unsecured Promissory Note, Alon | Alon      
Debt Instrument [Line Items]      
Principal installments $ 25.0    
Stated interest rate (as percent) 5.50%    
Final principal amortization payment $ 20.0    
Outstanding borrowings   $ 20.0