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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Decrease (increase) in:          
Accounts receivable - trade     $ 1,119.5 $ (578.0)  
Accounts receivable - related parties     1.0 1.6  
Inventories     (1,063.2) (44.2)  
Prepaid and other current assets     288.2 (305.3)  
Other assets     (27.7) (18.3)  
Increase (decrease) in:          
Accounts payable - trade     147.0 (55.4)  
Accounts payable - related parties     (41.0) 31.0  
Accrued product payables     (621.9) 666.6  
Accrued interest     (196.6) (158.4)  
Other current liabilities     (212.3) 133.6  
Other liabilities     (85.0) (82.2)  
Net effect of changes in operating accounts     (692.0) (409.0)  
Cash payments for interest, net of $96.9 and $102.9 capitalized during the nine months ended September 30, 2020 and 2019, respectively     1,107.4 996.1  
Capitalized interest [1] $ 34.5 $ 33.9 96.9 102.9  
Cash payments for federal and state income taxes     24.9 $ 24.7  
Liability for construction in progress expenditures     $ 272.1   $ 432.0
[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.