Document and Entity Information Document - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 18, 2020	Jun. 30, 2019
Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2019
Entity File Number	001-32236
Entity Registrant Name	COHEN & STEERS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	14-1904657
Entity Address, Address Line One	280 Park Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	832-3232
Title of 12(b) Security	Common Stock, $.01 par value
Trading Symbol	CNS
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
Entity Shell Company	false
Entity Public Float			$ 1.2
Entity Common Stock, Shares Outstanding		47,756,099
Entity Central Index Key	0001284812
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false