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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
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Total amount of AB Holding Units Purchased/Retained (in shares)	4.7	5.2
Total Cash Paid for AB Holding Units Purchased	$ 144.4	$ 211.8
Open Market Purchases of AB Holding Units Purchased (in shares)	2.0	2.3
Total Cash Paid for Open Market Purchases of AB Holding Units	$ 62.6	$ 92.7

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