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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Decrease (increase) in:
Accounts receivable - trade				$ (1,541.0)	$ 1,119.5
Accounts receivable - related parties				2.0	1.0
Inventories				520.2	(1,063.2)
Prepaid and other current assets				409.7	288.2
Other assets				104.0	(27.7)
Increase (decrease) in:
Accounts payable - trade				35.6	147.0
Accounts payable - related parties				(24.8)	(41.0)
Accrued product payables				2,501.8	(621.9)
Accrued interest				(230.4)	(196.6)
Other current liabilities				(696.3)	(212.3)
Other liabilities				(33.7)	(85.0)
Net effect of changes in operating accounts				1,047.1	(692.0)
Cash payments for interest, net of $63.8 and $96.9 capitalized during the nine months ended September 30, 2021 and 2020, respectively				1,143.5	1,107.4
Capitalized interest	[1]	$ 23.0	$ 34.5	63.8	96.9
Cash payments for federal and state income taxes				17.0	24.9
Liability for construction in progress expenditures				194.6		$ 236.1
Asset sales and related matters
Net losses attributable to asset sales and related matters				(8.4)	$ 2.1
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.

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