Derivatives (Volume of Contracts Outstanding) (Details) gal in Thousands, bu in Thousands, T in Thousands	Sep. 30, 2023 bu	Sep. 30, 2023 gal	Sep. 30, 2023 T	Dec. 31, 2022 bu	Dec. 31, 2022 gal	Dec. 31, 2022 T	Sep. 30, 2022 bu	Sep. 30, 2022 gal	Sep. 30, 2022 T
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,064,497	474,388	4,429	1,090,085	365,484	3,629	1,214,401	371,719	4,954
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	761,529	243,724	3,650	761,493	223,482	3,048	850,001	227,407	4,322
Non-exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	546,004	0	0	567,405	0	0	628,346	0	0
Non-exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	66,884	0	0	56,608	0	0	120,182	0	0
Non-exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	114,195	0	0	102,716	0	0	60,877	0	0
Non-exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	24,712	0	0	24,710	0	0	31,147	0	0
Non-exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	217,092	0	0	178,935	0	0	196,660	0
Non-exchange Traded | Dried distillers grain
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	669	0	0	449	0	0	391
Non-exchange Traded | Soybean meal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	686	0	0	570	0	0	483
Non-exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	9,734	26,632	2,295	10,054	44,547	2,029	9,449	30,747	3,448
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	302,968	230,664	779	328,592	142,002	581	364,400	144,312	632
Exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	158,900	0	0	170,280	0	0	206,705	0	0
Exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	36,135	0	0	46,380	0	0	68,520	0	0
Exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	106,068	0	0	111,567	0	0	87,580	0	0
Exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	1,865	0	0	365	0	0	1,450	0	0
Exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	121,002	0	0	94,206	0	0	91,770	0
Exchange Traded | Propane
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	108,990	0	0	47,208	0	0	50,904	0
Exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	672	779	0	588	581	145	1,638	632