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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Decrease (increase) in:          
Accounts receivable - trade     $ (688.9) $ 2,077.0  
Accounts receivable - related parties     (1.8) (0.1)  
Inventories     243.5 161.4  
Prepaid and other current assets     200.0 906.2  
Other assets     70.4 87.7  
Increase (decrease) in:          
Accounts payable - trade     150.4 81.9  
Accounts payable - related parties     (52.6) (73.1)  
Accrued product payables     1,245.8 (2,119.4)  
Accrued interest     (12.5) 30.0  
Other current liabilities     (726.3) (1,142.3)  
Other liabilities     (28.8) (98.3)  
Net effect of changes in operating accounts     399.2 (89.0)  
Cash payments for interest, net of $40.8 and $62.4 capitalized during the six months ended June 30, 2021 and 2020, respectively     624.0 577.5  
Capitalized interest [1] $ 21.2 $ 31.9 40.8 62.4  
Cash payments for federal and state income taxes     17.1 0.9  
Liability for construction in progress expenditures     224.5   $ 236.1
Asset sales and related matters          
Net losses attributable to asset sales and related matters     (11.2) $ 1.5  
Involuntary Conversions [Member]          
Asset sales and related matters          
Net losses attributable to asset sales and related matters     $ (11.3)    
[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.