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Derivative Instruments - Derivative Assets and Liabilities (Details)
$ in Millions
Mar. 31, 2020
bbl
Mar. 31, 2020
USD ($)
Mar. 31, 2020
MMBTU
Mar. 31, 2020
rins
Dec. 31, 2019
bbl
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MMBTU
Dec. 31, 2019
rins
Derivatives, Fair Value [Line Items]                
Assets   $ 2,593.4       $ 240.9    
Liabilities   (2,547.7)       (264.9)    
Counterparty netting and cash collateral, Assets   2,505.5       210.7    
Counterparty netting and cash collateral, Liabilities   (2,512.5)       (249.5)    
Total net fair value of derivative assets   87.9       30.2    
Total net fair value of derivative liabilities   (35.2)       (15.4)    
Footnote:                
Cash collateral   7.0       38.8    
Commodity contracts                
Footnote:                
Derivative, Nonmonetary Notional Amount 185,713,596   91,502,500   86,484,065   40,050,000  
RIN commitment contracts                
Footnote:                
Derivative, Nonmonetary Notional Amount | rins       86,300,000       147,000,000
Derivatives not designated as hedging instruments: | Commodity contracts | Other current assets                
Derivatives, Fair Value [Line Items]                
Assets   2,159.2       188.9    
Liabilities   2,087.9       202.1    
Derivatives not designated as hedging instruments: | Commodity contracts | Other current liabilities                
Derivatives, Fair Value [Line Items]                
Assets   244.1       24.4    
Liabilities   (275.7)       34.0    
Derivatives not designated as hedging instruments: | Commodity contracts | Other long-term assets                
Derivatives, Fair Value [Line Items]                
Assets   152.8       0.0    
Liabilities   (149.6)       0.0    
Derivatives not designated as hedging instruments: | Commodity contracts | Other long-term liabilities                
Derivatives, Fair Value [Line Items]                
Assets   23.3       23.4    
Liabilities   (24.4)       (24.8)    
Derivatives not designated as hedging instruments: | RIN commitment contracts | Other current assets                
Derivatives, Fair Value [Line Items]                
Assets   2.2       0.6    
Liabilities   0.0       0.0    
Derivatives not designated as hedging instruments: | RIN commitment contracts | Other current liabilities                
Derivatives, Fair Value [Line Items]                
Assets   0.0       0.0    
Liabilities   (1.7)       (1.9)    
Derivatives designated as hedging instruments: | Commodity contracts                
Footnote:                
Derivative, Nonmonetary Notional Amount | bbl 450,000       600,000      
Derivatives designated as hedging instruments: | Commodity contracts | Other current assets                
Derivatives, Fair Value [Line Items]                
Assets   7.3       3.4    
Liabilities   (5.2)       (2.0)    
Derivatives designated as hedging instruments: | Commodity contracts | Other current liabilities                
Derivatives, Fair Value [Line Items]                
Assets   4.5       0.0    
Liabilities   (3.2)       0.0    
Derivatives designated as hedging instruments: | Commodity contracts | Other long-term assets                
Derivatives, Fair Value [Line Items]                
Assets   0.0       0.2    
Liabilities   $ 0.0       $ (0.1)