CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net income	$ 217,679	$ 587,500
Other comprehensive loss - net unrealized loss on cash flow hedging derivatives, net of income tax benefit of $139 for the three months ended March 31, 2024		(434)
Comprehensive income	217,679	587,066
Comprehensive income attributable to noncontrolling interests	(528)	(3,459)
Comprehensive income attributable to Steel Dynamics, Inc.	$ 217,151	$ 583,607