Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 02, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
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, State or Province	NY
Entity Address, City or Town	New York
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	832-3232
Title of 12(b) Security	Common Stock
Trading Symbol	CNS
Security Exchange Name	NYSE
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 Common Stock, Shares Outstanding		47,785,725
Entity Central Index Key	0001284812
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false