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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Decrease (increase) in:      
Accounts receivable - trade $ (1,248.8) $ 730.2 $ (1,076.2)
Accounts receivable - related parties 0.9 (2.3) (0.7)
Inventories (558.0) 121.4 194.6
Prepaid and other current assets (69.6) 214.4 226.0
Other assets (63.5) (9.7) (111.0)
Increase (decrease) in:      
Accounts payable - trade (43.9) 18.3 66.6
Accounts payable - related parties 67.8 51.4 56.0
Accrued product payables 1,447.8 (1,132.0) 952.3
Accrued interest 36.1 37.6 17.3
Other current liabilities 58.1 (70.9) (291.4)
Other liabilities (84.3) 57.8 (1.3)
Net effect of changes in operating accounts (457.4) 16.2 32.2
Cash payments for interest, net of $143.8, $147.9 and $192.1 capitalized in 2019, 2018 and 2017, respectively 1,080.3 1,017.9 912.1
Capitalized interest [1] 143.8 147.9 192.1
Cash payments for federal and state income taxes 23.6 15.5 20.9
Liability for construction in progress expenditures 432.0 567.6 373.0
Contributions in aid of construction costs     46.1
Sale of Assets:      
Proceeds from asset sales 20.6 161.2 40.1
Net gains attributable to asset sales 5.7 28.7 10.7
Red River System [Member]      
Sale of Assets:      
Proceeds from asset sales 0.0 134.9 0.0
Net gains attributable to asset sales 0.0 20.6 0.0
Other Disposal of Assets [Member]      
Sale of Assets:      
Proceeds from asset sales 20.6 26.3 40.1
Net gains attributable to asset sales $ 5.7 $ 8.1 $ 10.7
[1] Capitalized interest is a component of “Interest expense” as presented on our Statements of Consolidated Operations.