Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 23, 2024	Jun. 30, 2023
Cover Abstract
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-13122
Entity Registrant Name	RELIANCE, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-1142616
Entity Address, Address Line One	16100 N. 71st Street, Suite 400
Entity Address, City or Town	Scottsdale
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85254
City Area Code	480
Local Phone Number	564-5700
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	RS
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 15,790,000,000
Entity Common Stock, Shares Outstanding		57,425,425
Entity Central Index Key	0000861884
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	KPMG LLP
Auditor Firm ID	185
Auditor Location	Los Angeles, California