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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Decrease (increase) in:      
Accounts receivable - trade $ 300.2 $ (1,248.8) $ 730.2
Accounts receivable - related parties (0.8) 0.9 (2.3)
Inventories (1,420.4) (558.0) 121.4
Prepaid and other current assets 991.4 (69.6) 214.4
Other assets (79.6) (63.5) (9.7)
Increase (decrease) in:      
Accounts payable - trade 11.3 (43.9) 18.3
Accounts payable - related parties (12.8) 67.8 51.4
Accrued product payables 482.7 1,447.8 (1,132.0)
Accrued interest 23.9 36.1 37.6
Other current liabilities (992.1) 58.1 (70.9)
Other liabilities (71.3) (84.3) 57.8
Net effect of changes in operating accounts (767.5) (457.4) 16.2
Cash payments for interest, net of $115.0, $143.8 and $147.9 capitalized in 2020, 2019 and 2018, respectively 1,201.3 1,080.3 1,017.9
Capitalized interest [1] 115.0 143.8 147.9
Cash payments for federal and state income taxes 25.1 23.6 15.5
Liability for construction in progress expenditures 236.1 432.0 567.6
Sale of Assets:      
Proceeds from asset sales 12.8 20.6 161.2
Net gains attributable to asset sales 4.4 5.7 28.7
Crude Oil Pipeline System [Member]      
Sale of Assets:      
Proceeds from asset sales 0.0 0.0 134.9
Net gains attributable to asset sales 0.0 0.0 20.6
Other Disposal of Assets [Member]      
Sale of Assets:      
Proceeds from asset sales 12.8 20.6 26.3
Net gains attributable to asset sales $ 4.4 $ 5.7 $ 8.1
[1] Capitalized interest is a component of “Interest expense” as presented on our Statements of Consolidated Operations.