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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Decrease (increase) in:      
Accounts receivable - trade $ (1,214.7) $ 1,702.4  
Accounts receivable - related parties (1.6) 0.5  
Inventories (95.7) 507.7  
Prepaid and other current assets 158.4 1,001.7  
Other assets 2.3 22.7  
Increase (decrease) in:      
Accounts payable - trade 83.5 22.4  
Accounts payable - related parties (64.4) (93.0)  
Accrued product payables 1,591.7 (1,743.1)  
Accrued interest (231.4) (193.4)  
Other current liabilities (160.2) (896.4)  
Other liabilities 31.1 10.2  
Net effect of changes in operating accounts 99.0 341.7  
Cash payments for interest, net of $19.6 and $30.5 capitalized during the three months ended March 31, 2021 and 2020, respectively 541.1 496.3  
Capitalized interest [1] 19.6 30.5  
Cash payments (refunds) for federal and state income taxes (4.5) 0.4  
Liability for construction in progress expenditures 283.4   $ 236.1
Asset sales and related matters      
Net losses attributable to asset sales and related matters (10.9) $ (0.1)  
Involuntary Conversions [Member]      
Asset sales and related matters      
Net losses attributable to asset sales and related matters $ (11.5)    
[1] We capitalize interest costs incurred on funds used to construct property, plant and equipment while the asset is in its construction phase.  The capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset’s estimated useful life as a component of depreciation expense.  When capitalized interest is recorded, it reduces interest expense from what it would be otherwise.