Derivative Financial Instruments (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Gains or losses on derivative instruments, statement of income
Ineffectiveness - amount of gains recognized in income on related hedged items	$ 10,000	$ 1,600,000	$ 295,000	$ 1,600,000
Derivative, Excluded Component, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Goods Sold.	Cost of Goods Sold.	Cost of Goods Sold.	Cost of Goods Sold.
Gain (loss) excluded from hedge effectiveness testing	$ 1,600,000	$ (3,400,000)	$ 1,100,000	$ 1,900,000
Amount of gain (loss) related to cash flow hedges	(21,400,000)	34,800,000	(3,200,000)	44,100,000
Net gains (losses) reclassified	2,600,000	$ 2,800,000	(599,000)	$ 7,200,000
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	(6,600,000)		$ (6,600,000)
Period Within Which The Company Expects To Reclassify Net Gains On Derivative Instruments From AOCI to Earnings			12 months
Futures | Commodity contract
Commodity contract commitments
Fair value of derivatives including required margin deposits	$ 22,000,000.0		$ 22,000,000.0		$ 24,900,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current		Other Assets, Current		Other Assets, Current