v3.25.2
Cover Page
Jul. 31, 2025
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jul. 31, 2025
Entity Registrant Name Acadian Asset Management Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-38979
Entity Tax Identification Number 47-1121020
Entity Address, Address Line One 200 State Street
Entity Address, Address Line Two Suite 601A
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02109
City Area Code 617
Local Phone Number 369-7300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001748824
Amendment Flag false
Common stock, par value $0.001 per share  
Entity Information [Line Items]  
Title of 12(b) Security Common stock, par value $0.001 per share
Trading Symbol AAMI
Security Exchange Name NYSE
4.800% Notes due 2026  
Entity Information [Line Items]  
Title of 12(b) Security 4.800% Notes due 2026
Trading Symbol AAMI 26
Security Exchange Name NYSE