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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Decrease (increase) in:      
Accounts receivable - trade $ (2,406.9) $ 300.2 $ (1,248.8)
Accounts receivable - related parties (15.7) (0.8) 0.9
Inventories 867.3 (1,420.4) (558.0)
Prepaid and other current assets (403.8) 991.4 (69.6)
Other assets 5.6 (79.6) (63.5)
Increase (decrease) in:      
Accounts payable - trade (20.8) 11.3 (43.9)
Accounts payable - related parties 17.0 (12.8) 67.8
Accrued product payables 2,663.5 482.7 1,447.8
Accrued interest (2.9) 23.9 36.1
Other current liabilities 602.0 (992.1) 58.1
Other liabilities 61.4 (71.3) (84.3)
Net effect of changes in operating accounts 1,366.7 (767.5) (457.4)
Cash payments for interest, net of $79.6, $115.0 and $143.8 capitalized in 2021, 2020 and 2019, respectively 1,230.7 1,201.3 1,080.3
Capitalized interest [1] 79.6 115.0 143.8
Cash payments for federal and state income taxes 18.1 25.1 23.6
Liability for construction in progress expenditures 183.3 236.1 432.0
Asset sales and related matters      
Proceeds from asset sales 64.3 12.8 20.6
Net gains (losses) attributable to asset sales and related matters (5.5) 4.4 5.7
Sale of natural gas gathering system and related treating facility [Member]      
Asset sales and related matters      
Proceeds from asset sales 39.1 0.0 0.0
Involuntary Conversions [Member]      
Asset sales and related matters      
Net gains (losses) attributable to asset sales and related matters (11.3) 0.0 0.0
Other Disposal of Assets [Member]      
Asset sales and related matters      
Proceeds from asset sales 25.2 12.8 20.6
Net gains (losses) attributable to asset sales and related matters $ 5.8 $ 4.4 $ 5.7
[1] Capitalized interest is a component of “Interest expense” as presented on our Statements of Consolidated Operations.