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Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Retirement Plans |  |  |
Defined Contribution Plan, Cost Recognized | $ 466.9 | $ 382.8 | $ 74.5
Profit sharing component | $ 421.6 | $ 359.8 | $ 58.3
Percentage of employer's profit sharing contribution | 8.00% | 8.00% | 8.00%
Employer's contribution to profit sharing plans for eligible employees | $ 337.2 | $ 287.8 | $ 46.7

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- Definition Represents the employer's contribution as percentage of consolidated pretax earnings, to the profit sharing plans. + References No definition available. + Details
Name: | stld_DefinedContributionPlanPercentageOfEmployersContributionOfPretaxEarningsToProfitSharingPlan
Namespace Prefix: | stld_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate amount of the employer's profit sharing component of which a portion was contributed to a defined benefit plan and a portion was paid directly to the participants of the profit sharing plan. + References No definition available. + Details
Name: | stld_ProfitSharingComponent
Namespace Prefix: | stld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the profit sharing component of the contribution made by the employer to the defined benefit plan. + References No definition available. + Details
Name: | stld_ProfitSharingComponentDefinedContributionPlanEmployersContributionToProfitSharingPlan
Namespace Prefix: | stld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration