Summary of Significant Accounting Policies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($) numberOfProducts	Dec. 31, 2025 USD ($)
Significant Accounting Policies [Line Items]
Variable interest entity, ownership percentage	10.00%
Commitments and contingencies
Unfunded Capital Commitments
Significant Accounting Policies [Line Items]
Other Commitment	46	$ 16
Additional Unfunded Capital Commitments
Significant Accounting Policies [Line Items]
Other Commitment	$ 30
Artisan Global Funds
Significant Accounting Policies [Line Items]
Number of consolidated VIEs \| numberOfProducts	3
Artisan Private Funds
Significant Accounting Policies [Line Items]
Number of consolidated VIEs \| numberOfProducts	4

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.