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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 18, 2022
Jun. 30, 2021
Cover Abstract      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-13122    
Entity Registrant Name RELIANCE STEEL & ALUMINUM CO    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-1142616    
Entity Address, Address Line One 350 South Grand Avenue, Suite 5100    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90071    
City Area Code 213    
Local Phone Number 687-7700    
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    
Entity Shell Company false    
Entity Public Float     $ 9,530,000,000
Entity Common Stock, Shares Outstanding   61,704,633  
Entity Central Index Key 0000861884    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location Los Angeles, California