Derivatives (Volume of Contracts Outstanding) (Details) gal in Thousands, bu in Thousands, T in Thousands	Mar. 31, 2024 bu	Mar. 31, 2024 gal	Mar. 31, 2024 T	Dec. 31, 2023 bu	Dec. 31, 2023 gal	Dec. 31, 2023 T	Mar. 31, 2023 bu	Mar. 31, 2023 gal	Mar. 31, 2023 T
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,029,111	400,472	3,937	911,026	416,381	3,993	1,111,695	361,219	3,283
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	711,845	235,646	3,432	650,828	244,139	3,168	765,821	244,711	2,732
Non-exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	553,569	0	0	519,825	0	0	572,079	0	0
Non-exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	28,902	0	0	41,848	0	0	50,184	0	0
Non-exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	90,195	0	0	66,953	0	0	101,663	0	0
Non-exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	32,437	0	0	15,355	0	0	31,658	0	0
Non-exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	198,453	0	0	206,986	0	0	200,591	0
Non-exchange Traded | Dried distillers grain
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	703	0	0	740	0	0	399
Non-exchange Traded | Soybean meal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	450	0	0	546	0	0	367
Non-exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	6,742	37,193	2,279	6,847	37,153	1,882	10,237	44,120	1,966
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	317,266	164,826	505	260,198	172,242	825	345,874	116,508	551
Exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	174,300	0	0	160,795	0	0	184,766	0	0
Exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	36,115	0	0	34,250	0	0	76,365	0	0
Exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	106,551	0	0	64,778	0	0	83,618	0	0
Exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	300	0	0	375	0	0	1,125	0	0
Exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	58,944	0	0	97,272	0	0	69,972	0
Exchange Traded | Propane
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	104,580	0	0	74,550	0	0	45,402	0
Exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	1,302	505	0	420	825	0	1,134	551