$STLD
STEEL DYNAMICS INC Stock $stld

$stld Overview Financials Valuation SEC Filings Company Website

2012 Form 10-K Financial Statement

#000104746913001827 Filed on February 27, 2013

Income Statement

Concept	2012	2011 Q4	2011 Q3
Revenue	$7.290B	$1.858B	$2.043B
YoY Change	-8.84%	21.61%	28.99%
Cost Of Revenue	$6.570B	$1.698B	$1.844B
YoY Change	-7.01%	21.78%	27.66%
Gross Profit	$719.9M	$160.1M	$199.2M
YoY Change	-22.72%	19.77%	42.83%
Gross Profit Margin	9.87%	8.62%	9.75%
Selling, General & Admin	$285.0M	$68.00M	$80.30M
YoY Change	-7.17%	8.11%	35.64%
% of Gross Profit	39.59%	42.46%	40.3%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$225.2M	$55.60M	$55.96M
YoY Change	1.17%	-0.36%	-2.16%
% of Gross Profit	31.28%	34.72%	28.09%
Operating Expenses	$328.7M	$77.70M	$90.46M
YoY Change	-5.18%	5.0%	28.13%
Operating Profit	$391.2M	$82.49M	$108.8M
YoY Change	-33.11%	38.17%	57.89%
Interest Expense	$158.6M	-$44.10M	$44.70M
YoY Change	-10.39%	-2.0%	-200.91%
% of Operating Profit	40.54%	-53.46%	41.09%
Other Income/Expense, Net	-$28.51M	$2.600M	$3.523M
YoY Change	-273.06%	-57.38%	-43.18%
Pretax Income	$204.1M	$41.00M	$67.61M
YoY Change	-51.91%	412.5%	118.79%
Income Tax	$61.79M	$15.20M	$27.75M
% Of Pretax Income	30.28%	37.07%	41.05%
Net Earnings	$142.3M	$25.78M	$39.86M
YoY Change	-46.45%	230.5%	113.14%
Net Earnings / Revenue	1.95%	1.39%	1.95%
Basic Earnings Per Share	$0.75	$0.14	$0.20
Diluted Earnings Per Share	$0.73	$0.14	$0.19
COMMON SHARES
Basic Shares Outstanding	219.2M shares		218.7M shares
Diluted Shares Outstanding	236.6M shares		235.8M shares

Balance Sheet

Concept	2012	2011 Q4	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$407.4M	$476.0M	$457.0M
YoY Change	-14.34%	154.55%	69.26%
Cash & Equivalents	$375.9M	$390.8M	$456.7M
Short-Term Investments	$31.50M	$85.00M
Other Short-Term Assets	$43.00M	$15.23M	$40.00M
YoY Change	5.91%	-61.93%	-13.04%
Inventory	$1.203B	$1.200B	$1.159B
Prepaid Expenses
Receivables	$642.4M	$679.9M	$816.0M
Other Receivables	$900.0K	$17.00M	$24.00M
Total Short-Term Assets	$2.296B	$2.455B	$2.496B
YoY Change	-6.48%	22.76%	24.18%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.231B	$2.194B	$2.168B
YoY Change	1.71%	-0.87%	-2.08%
Goodwill		$745.1M
YoY Change
Intangibles		$450.9M
YoY Change
Long-Term Investments	$22.70M
YoY Change	-8.84%
Other Assets	$110.1M	$107.7M	$132.0M
YoY Change	0.64%	-20.78%	-0.75%
Total Long-Term Assets	$3.519B	$3.524B	$3.507B
YoY Change	-0.13%	-1.84%	-2.57%
TOTAL ASSETS
Total Short-Term Assets	$2.296B	$2.455B	$2.496B
Total Long-Term Assets	$3.519B	$3.524B	$3.507B
Total Assets	$5.815B	$5.979B	$6.003B
YoY Change	-2.74%	6.96%	7.01%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$360.1M	$414.2M	$462.0M
YoY Change	-14.42%	18.69%	26.23%
Accrued Expenses	$203.0M	$80.95M	$239.0M
YoY Change	-9.62%	-59.32%	11.16%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$29.60M	$444.1M	$1.000M
YoY Change	-93.33%	4834.2%	-87.5%
Total Short-Term Liabilities	$609.7M	$1.100B	$717.0M
YoY Change	-44.59%	96.15%	20.5%
LONG-TERM LIABILITIES
Long-Term Debt	$2.173B	$1.936B	$2.379B
YoY Change	12.22%	-18.59%	-1.25%
Other Long-Term Liabilities	$19.20M	$82.28M	$77.00M
YoY Change	-76.67%	32.71%	24.19%
Total Long-Term Liabilities	$2.192B	$2.018B	$2.456B
YoY Change	8.6%	-17.28%	-0.61%
TOTAL LIABILITIES
Total Short-Term Liabilities	$609.7M	$1.100B	$717.0M
Total Long-Term Liabilities	$2.192B	$2.018B	$2.456B
Total Liabilities	$3.410B	$3.609B	$3.656B
YoY Change	-6.91%	4.33%	3.91%
SHAREHOLDERS EQUITY
Retained Earnings		$2.012B
YoY Change
Common Stock		$1.027B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)		$722.7M
YoY Change
Treasury Stock Shares		36.18M shares
Shareholders Equity	$2.406B	$2.300B	$2.302B
YoY Change
Total Liabilities & Shareholders Equity	$5.815B	$5.979B	$6.003B
YoY Change	-2.74%	6.96%	7.01%

Cashflow Statement

Concept	2012	2011 Q4	2011 Q3
OPERATING ACTIVITIES
Net Income	$142.3M	$25.78M	$39.86M
YoY Change	-46.45%	230.5%	113.14%
Depreciation, Depletion And Amortization	$225.2M	$55.60M	$55.96M
YoY Change	1.17%	-0.36%	-2.16%
Cash From Operating Activities	$445.7M	$94.00M	$222.5M
YoY Change	-8.37%	-870.49%	148.88%
INVESTING ACTIVITIES
Capital Expenditures	$223.5M	-$75.20M	$38.13M
YoY Change	33.84%	100.53%	-256.9%
Acquisitions
YoY Change
Other Investing Activities	$21.39M	-$70.70M	-$947.0K
YoY Change	-233.66%	290.61%	-205.22%
Cash From Investing Activities	-$191.6M	-$146.0M	-$37.10M
YoY Change	-18.74%	162.59%	59.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-268.9M	-13.90M	-6.300M
YoY Change	480.78%	-11.46%	-151.22%
NET CHANGE
Cash From Operating Activities	445.7M	94.00M	222.5M
Cash From Investing Activities	-191.6M	-146.0M	-37.10M
Cash From Financing Activities	-268.9M	-13.90M	-6.300M
Net Change In Cash	-14.80M	-65.90M	179.1M
YoY Change	-107.24%	-21.08%	128.44%
FREE CASH FLOW
Cash From Operating Activities	$445.7M	$94.00M	$222.5M
Capital Expenditures	$223.5M	-$75.20M	$38.13M
Free Cash Flow	$222.2M	$169.2M	$184.4M
YoY Change	-30.44%	568.77%	62.16%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2011801000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2315941000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2405465000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	-16041000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	2299900000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5979226000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	2377842000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2172606000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	2296225000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	11571000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	18303000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	181227000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	215485000	USD
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0025
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0025
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	900000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	900000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	255592901	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	255052811	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	219522655	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	218873720	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	36070246	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	36179091	shares
CY2011	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	7718714000	USD
CY2010	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	6060933000	USD
CY2011	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	278786000	USD
CY2010	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	239954000	USD
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	7997500000	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	6300887000	USD
CY2011	us-gaap	Cost Of Goods Sold CostOfGoodsSold	7065982000	USD
CY2010	us-gaap	Cost Of Goods Sold CostOfGoodsSold	5625221000	USD
CY2011	us-gaap	Gross Profit GrossProfit	931518000	USD
CY2010	us-gaap	Gross Profit GrossProfit	675666000	USD
CY2011	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	263595000	USD
CY2010	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	227046000	USD
CY2011	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	43149000	USD
CY2010	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	25476000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	39954000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	45586000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	12805000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	584820000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	364753000	USD
CY2011	us-gaap	Interest Expense InterestExpense	176977000	USD
CY2010	us-gaap	Interest Expense InterestExpense	170229000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	16476000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	18935000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	424319000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	213459000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	158627000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83860000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	265692000	USD
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	235992000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	234717000	shares
CY2010	us-gaap	Profit Loss ProfitLoss	129599000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-12428000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-11110000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	278120000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	140709000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.27
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	218471000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	216760000	shares
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.22
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.30
CY2012	us-gaap	Sales Revenue Net SalesRevenueNet	7290234000	USD
CY2012	us-gaap	Gross Profit GrossProfit	719898000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	391165000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	204066000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	163551000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	2003265000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	14014000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	65087000	USD
CY2010	us-gaap	Minority Interest Increase From Stock Issuance MinorityInterestIncreaseFromStockIssuance	5348000	USD
CY2010	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	23800000	USD
CY2010	stld	Tax Adjustment To Noncontrolling Interest TaxAdjustmentToNoncontrollingInterest	-1470000	USD
CY2010	stld	Stock Issued During Period Value Stock Options Granted And Restricted Stock Awards StockIssuedDuringPeriodValueStockOptionsGrantedAndRestrictedStockAwards	14966000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	129599000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	2076835000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	STEEL DYNAMICS INC
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001022671
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	220114512	shares
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012Q2	dei	Entity Public Float EntityPublicFloat	2065324161	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	390761000	USD
CY2011Q4	stld	Commercial Paper Not Included With Cash And Cash Equivalents CommercialPaperNotIncludedWithCashAndCashEquivalents	84830000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	679898000	USD
CY2011Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	42893000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	1199584000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	25341000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	16722000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	15229000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	2455258000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2193745000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	26528000	USD
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	450893000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	745066000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	107736000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	265692000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3662000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	87698000	USD
CY2012	us-gaap	Minority Interest Increase From Stock Issuance MinorityInterestIncreaseFromStockIssuance	9839000	USD
CY2011Q4	us-gaap	Assets Assets	5979226000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	414240000	USD
CY2011Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	6584000	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	10880000	USD
CY2011Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	107423000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	80947000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	444078000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1100417000	USD
CY2011Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	37272000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1936022000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-489915000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	82278000	USD
CY2011Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	70694000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	636000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	722653000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1026157000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	13396000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	87452000	USD
CY2011	us-gaap	Minority Interest Increase From Stock Issuance MinorityInterestIncreaseFromStockIssuance	12989000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	567000	USD
CY2011	stld	Stock Issued During Period Value Stock Options Granted And Restricted Stock Awards StockIssuedDuringPeriodValueStockOptionsGrantedAndRestrictedStockAwards	19007000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	151000	USD
CY2012	stld	Stock Issued During Period Value Stock Options Granted And Restricted Stock Awards StockIssuedDuringPeriodValueStockOptionsGrantedAndRestrictedStockAwards	10005000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	142281000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9008000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	186513000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b><i>Use of Estimates</i></b></font></p> <p style="FONT-FAMILY: times"><font size="2">        These financial statements are prepared in conformity with accounting principles generally accepted in the United States, and accordingly, include amounts that require management to make estimates and assumptions that affect the amounts reported in the financial statements and in the notes thereto. Significant items subject to such estimates and assumptions include the carrying value of property, plant and equipment, intangible assets and goodwill; valuation allowances for trade receivables, inventories and deferred income tax assets; unrecognized tax benefits; potential environmental liabilities; and litigation claims and settlements. Actual results may differ from these estimates and assumptions.</font></p></div>
CY2012	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b><i>Concentration of Credit Risk</i></b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Financial instruments that potentially subject the company to significant concentrations of credit risk principally consist of temporary cash investments, short-term commercial paper, and accounts receivable. The company places its temporary cash and short-term commercial paper investments with high credit quality financial institutions and companies, and limits the amount of credit exposure from any one entity. The company is exposed to credit risk in the event of nonpayment by customers. The company mitigates its exposure to credit risk, which it generally extends initially on an unsecured basis, by performing ongoing credit evaluations and taking further action if necessary, such as requiring letters of credit or other security interests to support the customer receivable. Management's estimation of the allowance for doubtful accounts is based upon known credit risks, historical loss experience and current economic conditions affecting the company's customers. Customer accounts receivable are charged off when all collection efforts have been exhausted and the amounts are deemed uncollectible. Heidtman Steel Products (Heidtman), a related party, accounted for 6% of the company's net accounts receivable at December 31, 2012, and 5% at December 31, 2011.</font></p></div>
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2012	stld	Percentage Of Workforce Subject To Collective Bargaining Arrangements PercentageOfWorkforceSubjectToCollectiveBargainingArrangements	0.10	pure
CY2012	stld	Collective Bargaining Arrangements Agreements Number CollectiveBargainingArrangementsAgreementsNumber	1	agreement
CY2012	stld	Workforce Subject To Collective Bargaining Arrangements WorkforceSubjectToCollectiveBargainingArrangements	115	employee
CY2012	stld	Workforce Subject To Collective Bargaining Arrangements Locations Number WorkforceSubjectToCollectiveBargainingArrangementsLocationsNumber	1	location
CY2012Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	594388000	USD
CY2011Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	609150000	USD
CY2012Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	278494000	USD
CY2011Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	251716000	USD
CY2012Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	82934000	USD
CY2011Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	106609000	USD
CY2012Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	246691000	USD
CY2011Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	232109000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	1202507000	USD
CY2011Q4	us-gaap	Investments Investments	24900000	USD
CY2012Q4	us-gaap	Investments Investments	22700000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3761759000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3551561000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1357816000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1530561000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2231198000	USD
CY2012	us-gaap	Depreciation Depreciation	179900000	USD
CY2011	us-gaap	Depreciation Depreciation	176500000	USD
CY2010	us-gaap	Depreciation Depreciation	171700000	USD
CY2011Q4	stld	Intangible Assets Net Excluding Goodwill Gross IntangibleAssetsNetExcludingGoodwillGross	632120000	USD
CY2012Q4	stld	Intangible Assets Net Excluding Goodwill Gross IntangibleAssetsNetExcludingGoodwillGross	632120000	USD
CY2011Q4	stld	Intangible Assets Net Excluding Goodwill Accumulated Amortization IntangibleAssetsNetExcludingGoodwillAccumulatedAmortization	181227000	USD
CY2012Q4	stld	Intangible Assets Net Excluding Goodwill Accumulated Amortization IntangibleAssetsNetExcludingGoodwillAccumulatedAmortization	215485000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	416635000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	35553000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	30476000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	26090000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	23390000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	20902000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	18193000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	107784000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	150217000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	219159000	shares
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	226835000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	738542000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12500000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17300000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14700000	USD
CY2012	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	9432000	USD
CY2011	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	9432000	USD
CY2010	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	9508000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	172983000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	287552000	USD
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	916000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1139000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1575000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	16549000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	16382000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	16382000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	236624000	shares
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	2380100000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	2202237000	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	29631000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	75900000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-66300000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	46900000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11334000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	128209000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	39554000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	50451000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	30418000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	44306000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	61785000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.034	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.035	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.032	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.015	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.011	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.011	pure
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.303	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.374	pure
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.393	pure
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	43037000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	44107000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	428699000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	68500000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	11482000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	508681000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-464574000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	465273000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	79998000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	11621000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	556892000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-513855000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22245000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	64555000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	49396000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	49587000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2046000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	300000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	741000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	13785000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1361000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	40741000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	196000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	496000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1128000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2310000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	476000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	228000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9500000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-5900000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	-413000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	6200000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	87633000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	81882000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	64969000	USD
CY2012Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	3600000	shares
CY2012Q4	stld	Contractual Obligation Outstanding Construction Related Commitments ContractualObligationOutstandingConstructionRelatedCommitments	74500000	USD
CY2012Q4	stld	Number Of Other Steel Manufacturing Companies NumberOfOtherSteelManufacturingCompanies	8	company
CY2012Q4	stld	Number Of Complaints Not Related To Steel Purchasers NumberOfComplaintsNotRelatedToSteelPurchasers	1	complaint
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	22900000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	37200000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	22900000	USD
CY2012	stld	Defined Contribution Plan Percentage Of Employers Contribution Of Pretax Earnings To Profit Sharing Plan DefinedContributionPlanPercentageOfEmployersContributionOfPretaxEarningsToProfitSharingPlan	0.02	pure
CY2012	stld	Profit Sharing Component Defined Contribution Plan Employers Contribution To Profit Sharing Plan ProfitSharingComponentDefinedContributionPlanEmployersContributionToProfitSharingPlan	14300000	USD
CY2011	stld	Profit Sharing Component Defined Contribution Plan Employers Contribution To Profit Sharing Plan ProfitSharingComponentDefinedContributionPlanEmployersContributionToProfitSharingPlan	17500000	USD
CY2010	stld	Profit Sharing Component Defined Contribution Plan Employers Contribution To Profit Sharing Plan ProfitSharingComponentDefinedContributionPlanEmployersContributionToProfitSharingPlan	10500000	USD
CY2012	us-gaap	Payments For Rent PaymentsForRent	14800000	USD
CY2011	us-gaap	Payments For Rent PaymentsForRent	16800000	USD
CY2010	us-gaap	Payments For Rent PaymentsForRent	15400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	10585000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	8090000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	6081000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4600000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	2129000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12447000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	43932000	USD
CY2012	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Entitys Country Of Domicile EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile	6851365000	USD
CY2012	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Foreign Countries EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries	438869000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	225216000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	223525000	USD
CY2011	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Entitys Country Of Domicile EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile	7519048000	USD
CY2011	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Foreign Countries EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries	478452000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	222607000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	167007000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	3338760000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	3608632000	USD
CY2012	stld	Percentage Of Ownership Interest In Subsidiaries PercentageOfOwnershipInterestInSubsidiaries	1.00	pure
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	375917000	USD
CY2012Q4	stld	Commercial Paper Not Included With Cash And Cash Equivalents CommercialPaperNotIncludedWithCashAndCashEquivalents	31520000	USD
CY2012Q4	stld	Accounts Receivable Net Current Including Related Party Receivables AccountsReceivableNetCurrentIncludingRelatedPartyReceivables	642363000	USD
CY2012Q4	stld	Other Assets Including Income Tax Current OtherAssetsIncludingIncomeTaxCurrent	43918000	USD
CY2012Q4	stld	Other Assets Noncurrent Including Restricted Cash OtherAssetsNoncurrentIncludingRestrictedCash	132816000	USD
CY2012Q4	stld	Accounts Payable And Dividends Payable Including Related Party Payables AccountsPayableAndDividendsPayableIncludingRelatedPartyPayables	360097000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	219949000	USD
CY2012Q4	stld	Other Liabilities Including Deferred Income Taxes Noncurrent OtherLiabilitiesIncludingDeferredIncomeTaxesNoncurrent	556477000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	98814000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	637000	USD
CY2012	us-gaap	Interest Expense InterestExpense	158585000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-28514000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	-27623000	USD
CY2011Q4	stld	Accounts Receivable Net Current Including Related Party Receivables AccountsReceivableNetCurrentIncludingRelatedPartyReceivables	722791000	USD
CY2011Q4	stld	Other Assets Including Income Tax Current OtherAssetsIncludingIncomeTaxCurrent	57292000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	142281000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-21270000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	346698000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	310913000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	445694000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-191601000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-268937000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-14844000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-60064000	USD
CY2012	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	1049969000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	720479000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1037687000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2087620000	USD
CY2011Q4	stld	Other Assets Noncurrent Including Restricted Cash OtherAssetsNoncurrentIncludingRestrictedCash	134264000	USD
CY2011Q4	stld	Accounts Payable And Dividends Payable Including Related Party Payables AccountsPayableAndDividendsPayableIncludingRelatedPartyPayables	420824000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	235515000	USD
CY2011Q4	stld	Other Liabilities Including Deferred Income Taxes Noncurrent OtherLiabilitiesIncludingDeferredIncomeTaxesNoncurrent	572193000	USD
CY2012	us-gaap	Cost Of Goods Sold CostOfGoodsSold	6570336000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	328733000	USD
CY2012	us-gaap	Repayments Of Debt RepaymentsOfDebt	1258842000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	486355000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-235837000	USD
CY2011	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	10103000	USD
CY2011	us-gaap	Repayments Of Debt RepaymentsOfDebt	7740000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-48633000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-46270000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	204248000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	169307000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-149078000	USD
CY2010	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	556553000	USD
CY2010	us-gaap	Repayments Of Debt RepaymentsOfDebt	346963000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-52314000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	157276000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	177505000	USD
CY2012Q1	us-gaap	Sales Revenue Net SalesRevenueNet	1982040000	USD
CY2012Q1	us-gaap	Gross Profit GrossProfit	201264000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	119816000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	41777000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	45675000	USD
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2012Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1909803000	USD
CY2012Q2	us-gaap	Gross Profit GrossProfit	182136000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	103699000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	39305000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	44472000	USD
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2012Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1693390000	USD
CY2012Q3	us-gaap	Gross Profit GrossProfit	156401000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	72721000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	6105000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	12833000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2012Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1705001000	USD
CY2012Q4	us-gaap	Gross Profit GrossProfit	180097000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	94929000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	55094000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	60571000	USD
CY2011Q1	us-gaap	Sales Revenue Net SalesRevenueNet	2015969000	USD
CY2011Q1	us-gaap	Gross Profit GrossProfit	295754000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	205326000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	104230000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	105903000	USD
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.49
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.46
CY2011Q2	us-gaap	Sales Revenue Net SalesRevenueNet	2079731000	USD
CY2011Q2	us-gaap	Gross Profit GrossProfit	276386000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	188219000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	95826000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	98710000	USD
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2011Q3	us-gaap	Sales Revenue Net SalesRevenueNet	2043455000	USD
CY2011Q3	us-gaap	Gross Profit GrossProfit	199243000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	108785000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	39857000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	43304000	USD
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2011Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1858345000	USD
CY2011Q4	us-gaap	Gross Profit GrossProfit	160135000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	82490000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	25779000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	30203000	USD
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.14
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6969000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6707000	USD
CY2012	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	7007417000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	29631000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	318115000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	544470000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	182559000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1124425000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	3037000	USD
CY2012	us-gaap	Interest Costs Incurred InterestCostsIncurred	160000000	USD
CY2011	us-gaap	Interest Costs Incurred InterestCostsIncurred	178700000	USD
CY2010	us-gaap	Interest Costs Incurred InterestCostsIncurred	177200000	USD
CY2012	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	1400000	USD
CY2011	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	1700000	USD
CY2010	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	7000000	USD
CY2012	us-gaap	Interest Paid InterestPaid	154100000	USD
CY2011	us-gaap	Interest Paid InterestPaid	171800000	USD
CY2010	us-gaap	Interest Paid InterestPaid	162400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	9287000	USD
CY2012Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8300000	USD
CY2012	stld	Expenses Recorded Related To Cash Tender ExpensesRecordedRelatedToCashTender	40300000	USD
CY2012	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	4000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3150000	USD
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8250000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	224698000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	17283000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	14688000	USD
CY2011	stld	Deferred Income Tax Noncash Expense Benefit DeferredIncomeTaxNoncashExpenseBenefit	34436000	USD
CY2010	stld	Deferred Income Tax Noncash Expense Benefit DeferredIncomeTaxNoncashExpenseBenefit	46097000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	3925000	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-1215000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	100602000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	196556000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	85523000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	261110000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5683000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	15335000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	56551000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	71169000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	26242000	USD
CY2010	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	99276000	USD
CY2011	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	47911000	USD
CY2010	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	42761000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	133394000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-16000000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	15684000	USD
CY2011	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	13396000	USD
CY2010	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	14014000	USD
CY2011	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	27389000	USD
CY2010	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	5348000	USD
CY2011	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	567000	USD
CY2012	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	282817000	USD
CY2012	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	257943000	USD
CY2012	us-gaap	Other Labor Related Expenses OtherLaborRelatedExpenses	26987000	USD
CY2010	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Entitys Country Of Domicile EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile	5948184000	USD
CY2010	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Foreign Countries EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries	352703000	USD
CY2010Q4	us-gaap	Assets Assets	5589934000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	3458804000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	36265000	USD
CY2012Q4	us-gaap	Assets Assets	5815416000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	5815416000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	599499000	USD
CY2012Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	42864000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	23449000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	893000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	19576000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	27749000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	105067000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	344953000	USD
CY2012Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	15144000	USD
CY2012Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	16941000	USD
CY2012Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	85802000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	35306000	USD
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	81900000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	609677000	USD
CY2012Q4	us-gaap	Secured Long Term Debt SecuredLongTermDebt	247500000	USD
CY2012Q4	us-gaap	Unsecured Long Term Debt UnsecuredLongTermDebt	1600000000	USD
CY2012Q4	us-gaap	Convertible Debt Noncurrent ConvertibleDebtNoncurrent	287496000	USD
CY2012Q4	us-gaap	Other Long Term Debt Noncurrent OtherLongTermDebtNoncurrent	37610000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	-537304000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	19173000	USD
CY2011Q4	us-gaap	Unsecured Long Term Debt UnsecuredLongTermDebt	1611250000	USD
CY2011Q4	us-gaap	Convertible Debt Noncurrent ConvertibleDebtNoncurrent	287500000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	12481000	USD
CY2012	stld	Deferred Income Tax Noncash Expense Benefit DeferredIncomeTaxNoncashExpenseBenefit	54528000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-509000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-85977000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-13845000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1337000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-32593000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	21644000	USD
CY2012	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-85107000	USD
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	53310000	USD
CY2012	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	13901000	USD
CY2012Q3	stld	Number Of Small Joint Ventures Terminated NumberOfSmallJointVenturesTerminated	2	item
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	22714000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	31670000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	9643000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	-84830000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	21386000	USD
CY2012	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	3662000	USD
CY2012	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	37959000	USD
CY2012	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	151000	USD

Files In Submission

Name	View Source	Status
0001047469-13-001827-index-headers.html	Edgar Link	pending
0001047469-13-001827-index.html	Edgar Link	pending
0001047469-13-001827.txt	Edgar Link	pending
0001047469-13-001827-xbrl.zip	Edgar Link	pending
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a2213113zex-32_2.htm	Edgar Link	pending
a2213113zex-95.htm	Edgar Link	pending
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g144280.jpg	Edgar Link	pending
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g22702.jpg	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
stld-20121231.xml	Edgar Link	completed
stld-20121231.xsd	Edgar Link	pending
stld-20121231_cal.xml	Edgar Link	unprocessable
stld-20121231_def.xml	Edgar Link	unprocessable
stld-20121231_lab.xml	Edgar Link	unprocessable
stld-20121231_pre.xml	Edgar Link	unprocessable

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$STLD
STEEL DYNAMICS INC Stock $stld

2012 Form 10-K Financial Statement

#000104746913001827 Filed on February 27, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$STLD STEEL DYNAMICS INC Stock $stld

2012 Form 10-K Financial Statement

#000104746913001827 Filed on February 27, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$STLD
STEEL DYNAMICS INC Stock $stld