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Document and Entity Information
Nov. 10, 2021
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001563190
Document Type 8-K
Document Period End Date Nov. 10, 2021
Entity Registrant Name Compass, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-40291
Entity Tax Identification Number 30-0751604
Entity Address, Address Line One 90 Fifth Avenue
Entity Address, Address Line Two 3rd Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10011
City Area Code (212)
Local Phone Number 913-9058
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Class A Common Stock, $0.00001 par value per share
Trading Symbol COMP
Security Exchange Name NYSE
Entity Emerging Growth Company false