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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Schedule of Repurchases of AB Holding Units | Repurchases of AB Holding Units for the years ended December 31, 2024 and 2023 consisted of the following:
| Years Ended December 31
| 2024 | 2023
| (in millions)
Total amount of AB Holding Units Purchased(1) |  | 4.5 |  |  | 4.7 |
Total Cash Paid for AB Holding Units Purchased(1) |  | $ | 156.2 |  |  | $ | 144.4 |
Open Market Purchases of AB Holding Units Purchased(1) |  | 1.8 |  |  | 2.0 |
Total Cash Paid for Open Market Purchases of AB Holding Units(1) |  | $ | 60.1 |  |  | $ | 62.6 |
(1)Purchased on a trade-date basis. The difference between open-market purchases and units retained reflects the retention of AB Holding Units from employees to fulfill statutory tax withholding requirements at the time of delivery of long-term incentive compensation awards.

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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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