Derivatives (Volume of Contracts Outstanding) (Details) gal in Thousands, bu in Thousands, T in Thousands	Sep. 30, 2022 bu	Sep. 30, 2022 gal	Sep. 30, 2022 T	Dec. 31, 2021 bu	Dec. 31, 2021 gal	Dec. 31, 2021 T	Sep. 30, 2021 bu	Sep. 30, 2021 gal	Sep. 30, 2021 T
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,214,401	371,719	4,954	1,319,055	341,763	3,258	1,343,348	297,949	2,633
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	850,001	227,407	4,322	961,715	208,539	2,905	943,916	176,645	2,392
Non-exchange Traded \| Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	628,346	0	0	685,681	0	0	687,177	0	0
Non-exchange Traded \| Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	120,182	0	0	77,592	0	0	96,061	0	0
Non-exchange Traded \| Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	60,877	0	0	109,547	0	0	94,132	0	0
Non-exchange Traded \| Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	31,147	0	0	31,627	0	0	35,460	0	0
Non-exchange Traded \| Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	196,660	0	0	192,447	0	0	174,381	0
Non-exchange Traded \| Dried distillers grain
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	391	0	0	507	0	0	533
Non-exchange Traded \| Soybean meal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	483	0	0	544	0	0	465
Non-exchange Traded \| Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	9,449	30,747	3,448	57,268	16,092	1,854	31,086	2,264	1,394
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	364,400	144,312	632	357,340	133,224	353	399,432	121,304	241
Exchange Traded \| Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	206,705	0	0	226,215	0	0	236,395	0	0
Exchange Traded \| Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	68,520	0	0	64,730	0	0	60,660	0	0
Exchange Traded \| Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	87,580	0	0	65,020	0	0	101,087	0	0
Exchange Traded \| Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,450	0	0	1,300	0	0	1,290	0	0
Exchange Traded \| Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	91,770	0	0	100,884	0	0	96,894	0
Exchange Traded \| Propane
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	50,904	0	0	31,542	0	0	24,402	0
Exchange Traded \| Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	145	1,638	632	75	798	353	0	8	241