CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net income	$ 579,782	$ 918,475	$ 2,040,292	$ 3,240,481
Other comprehensive income - net unrealized gain (loss) on cash flow hedging derivatives, net of income tax expense (benefit) of ($485) and $703 for the three months ended, and ($441) and ($205) for the nine months ended September 30, 2023 and 2022, respectively	(1,521)	2,251	(1,383)	(657)
Comprehensive income	578,261	920,726	2,038,909	3,239,824
Comprehensive income attributable to noncontrolling interests	(2,587)	(4,150)	(13,680)	(12,671)
Comprehensive income attributable to Steel Dynamics, Inc.	$ 575,674	$ 916,576	$ 2,025,229	$ 3,227,153