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v3.24.1.u1

Employee Benefits (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($) item
Employee Benefits |
Estimated withdrawal liabilities | $ | $ 4.6
Number of multiemployer plans the company anticipates withdrawing from | item | 2

X
- Definition Represents the number of multiemployer plans the company anticipates withdrawing from. + References No definition available. + Details
Name: | rs_NumberOfMultiemployerPlansWithdrawnFrom
Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | rs_PensionAndOtherPostretirementBenefitsDisclosureAndPostemploymentBenefitsDisclosureAbstract
Namespace Prefix: | rs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
Name: | us-gaap_MultiemployerPlansWithdrawalObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant