Qualified Employee Benefit Plans	6 Months Ended
	Jun. 30, 2025
Retirement Benefits [Abstract]
Qualified Employee Benefit Plans	Qualified Employee Benefit PlansWe maintained a qualified, noncontributory, defined benefit retirement plan (the “Retirement Plan”) covering current and former employees who were employed by AB in the United States prior to October 2, 2000. During 2024, the Compensation Committee of the AB Board of Directors approved the termination of the Retirement Plan, effective May 22, 2024. We began the process of settling benefits with vested participants and all lump sum disbursements elected by plan participants were distributed in December 2024 in the amount of $35.0 million. The remaining retirement plan participants who did not elect a lump sum disbursement elected to roll over their benefit to a group annuity contract from a qualified insurance company to administer all future payments. During the six months ended June 30, 2025, we settled all future obligations under the Retirement Plan and transferred the remaining benefit obligations to a qualified third party insurance provider under a group annuity contract. The final annuity premium transferred was $59.4 million. Following the settlement related to the annuity purchase, the plans funded status was in a deficit and the company funded an additional $1.7 million to cover all remaining obligations. As a result of the settlement, we recognized a non-cash settlement charge of approximately $20.8 million related to Retirement Plan losses and the reclassification from accumulated other comprehensive loss to general and administrative expenses in the condensed consolidated statements of income.