CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 918,475	$ 1,000,159	$ 3,240,481	$ 2,151,117
Other comprehensive income - net unrealized gain (loss) on cash flow hedging derivatives, net of income tax (benefit) of $703, ($6,797), ($205), and $2,711 for the three and nine-month periods ended September 30, 2022 and 2021, respectively	2,251	(21,761)	(657)	8,681
Comprehensive income	920,726	978,398	3,239,824	2,159,798
Comprehensive income attributable to noncontrolling interests	(4,150)	(9,396)	(12,671)	(27,556)
Comprehensive income attributable to Steel Dynamics, Inc.	$ 916,576	$ 969,002	$ 3,227,153	$ 2,132,242