Employee Benefits	6 Months Ended
Jun. 30, 2024
Employee Benefits
Employee Benefits	Note 12. Employee Benefits Certain of our union employees participate in plans collectively bargained and maintained by multiple employers and a labor union. During the six months ended June 30, 2024, we recognized estimated withdrawal liabilities of $4.6 million based on our anticipated withdrawal from two multiemployer plans.

Description containing the entire pension and other postretirement benefits disclosure as a single block of text and description containing the entire postemployment benefits disclosure which may include supplemental unemployment benefits, obligations recognized for all types of benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement. Disclosure may also include discussion that an obligation for postemployment benefits is not accrued in accordance with regulation only because the amount cannot be reasonably estimated.

No definition available.

Name:	rs_PensionAndOtherPostretirementBenefitsDisclosureAndPostemploymentBenefitsDisclosureTextBlock
Namespace Prefix:	rs_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration