Derivatives (Volume of Contracts Outstanding) (Details) gal in Thousands, bu in Thousands, T in Thousands	Mar. 31, 2023 bu	Mar. 31, 2023 gal	Mar. 31, 2023 T	Dec. 31, 2022 bu	Dec. 31, 2022 gal	Dec. 31, 2022 T	Mar. 31, 2022 bu	Mar. 31, 2022 gal	Mar. 31, 2022 T
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,111,695	361,219	3,283	1,090,085	365,484	3,629	1,447,086	300,986	4,610
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	765,821	244,711	2,732	761,493	223,482	3,048	1,013,116	239,078	4,063
Non-exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	572,079	0	0	567,405	0	0	722,719	0	0
Non-exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	50,184	0	0	56,608	0	0	133,043	0	0
Non-exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	101,663	0	0	102,716	0	0	102,690	0	0
Non-exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	31,658	0	0	24,710	0	0	45,967	0	0
Non-exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	200,591	0	0	178,935	0	0	214,513	0
Non-exchange Traded | Dried distillers grain
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	399	0	0	570	0	0	435
Non-exchange Traded | Soybean meal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	367	0	0	449	0	0	550
Non-exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	10,237	44,120	1,966	10,054	44,547	2,029	8,697	24,565	3,078
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	345,874	116,508	551	328,592	142,002	581	433,970	61,908	547
Exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	184,766	0	0	170,280	0	0	267,135	0	0
Exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	76,365	0	0	46,380	0	0	86,410	0	0
Exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	83,618	0	0	111,567	0	0	78,500	0	0
Exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,125	0	0	365	0	0	1,815	0	0
Exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	69,972	0	0	94,206	0	0	47,082	0
Exchange Traded | Propane
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	45,402	0	0	47,208	0	0	13,356	0
Exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	1,134	551	0	588	581	110	1,470	547