CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net income	$ 320,894	$ 579,782	$ 1,340,084	$ 2,040,292
Other comprehensive income (loss) - net unrealized gain (loss) on cash flow hedging derivatives, net of income tax expense (benefit) of $314 and ($485) for the three months ended, and ($276) and ($441) for the nine months ended September 30, 2024 and 2023, respectively	983	(1,521)	(866)	(1,383)
Comprehensive income	321,877	578,261	1,339,218	2,038,909
Comprehensive income attributable to noncontrolling interests	(3,092)	(2,587)	(10,243)	(13,680)
Comprehensive income attributable to Steel Dynamics, Inc.	$ 318,785	$ 575,674	$ 1,328,975	$ 2,025,229