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Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retirement Plans |  |  |
Defined Contribution Plan, Cost | $ 209.0 | $ 312.4 | $ 466.9
Profit sharing component | $ 165.2 | $ 264.6 | $ 421.6
Percentage of employer's profit sharing contribution | 8.00% | 8.00% | 8.00%
Employer's contribution to profit sharing plans for eligible employees | $ 132.2 | $ 211.6 | $ 337.2

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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 -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration