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Summary of Significant Accounting Policies - Schedule of Repurchase Activity (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Total amount of AB Holding Units Purchased (in units)	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 units)	1.8	2.0
Total Cash Paid for Open Market Purchases of AB Holding Units	$ 60.1	$ 62.6

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details