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Summary of Significant Accounting Policies - Schedule of Repurchases of AB Holding Units (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounting Policies [Abstract] |  |
Total amount of AB Holding Units Purchased/Retained (in shares) | 4.5 | 4.7
Total Cash Paid for AB Holding Units Purchased | $ 156.2 | $ 144.4
Open Market Purchases of AB Holding Units Purchased (in shares) | 1.8 | 2.0
Total Cash Paid for Open Market Purchases of AB Holding Units | $ 60.1 | $ 62.6

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