CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 2,467,332	$ 3,879,492	$ 3,246,814
Other comprehensive income (loss) - net unrealized gain (loss) on cash flow hedging derivatives, net of income tax benefit of $149, income tax expense of $937, and income tax benefit of $1,247 for 2023, 2022 and 2021, respectively	(468)	2,980	(3,993)
Comprehensive income	2,466,864	3,882,472	3,242,821
Comprehensive income attributable to noncontrolling interests	(16,450)	(16,818)	(32,748)
Comprehensive income attributable to Steel Dynamics, Inc.	$ 2,450,414	$ 3,865,654	$ 3,210,073