Derivatives (Volume of Contracts Outstanding) (Details) gal in Thousands, bu in Thousands, T in Thousands	Jun. 30, 2023 bu	Jun. 30, 2023 gal	Jun. 30, 2023 T	Dec. 31, 2022 bu	Dec. 31, 2022 gal	Dec. 31, 2022 T	Jun. 30, 2022 bu	Jun. 30, 2022 gal	Jun. 30, 2022 T
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,130,484	381,468	3,866	1,090,085	365,484	3,629	1,251,576	347,073	4,131
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	865,282	242,070	3,473	761,493	223,482	3,048	888,278	226,155	3,771
Non-exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	547,805	0	0	567,405	0	0	628,471	0	0
Non-exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	42,273	0	0	56,608	0	0	116,679	0	0
Non-exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	236,316	0	0	102,716	0	0	97,224	0	0
Non-exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	27,824	0	0	24,710	0	0	37,355	0	0
Non-exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	208,251	0	0	178,935	0	0	200,388	0
Non-exchange Traded | Dried distillers grain
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	479	0	0	449	0	0	318
Non-exchange Traded | Soybean meal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	290	0	0	570	0	0	421
Non-exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	11,064	33,819	2,704	10,054	44,547	2,029	8,549	25,767	3,032
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	265,202	139,398	393	328,592	142,002	581	363,298	120,918	360
Exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	177,425	0	0	170,280	0	0	219,020	0	0
Exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	27,555	0	0	46,380	0	0	69,115	0	0
Exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	59,262	0	0	111,567	0	0	74,418	0	0
Exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	960	0	0	365	0	0	650	0	0
Exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	74,760	0	0	94,206	0	0	94,794	0
Exchange Traded | Propane
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	63,630	0	0	47,208	0	0	25,578	0
Exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	1,008	393	0	588	581	95	546	360