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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 14, 2025
Jun. 28, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39716    
Entity Registrant Name GCM Grosvenor Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-2226287    
Entity Address, Address Line One 900 North Michigan Avenue, Suite 1100    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60611    
City Area Code 312    
Local Phone Number 506-6500    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 423.7
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s definitive proxy statement relating to its 2025 annual meeting of the shareholders (the “2025 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 2025 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates. 		   
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001819796    
Amendment Flag false    
Class A Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Class A common stock, $0.0001 par value per share    
Trading Symbol GCMG    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   44,911,734  
Warrant      
Document Information [Line Items]      
Title of 12(b) Security Warrants to purchase shares of Class A common stock    
Trading Symbol GCMGW    
Security Exchange Name NASDAQ    
Class C Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   144,235,246