Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

Repurchases of AB Holding Units for the years ended December 31, 2020 and 2019 consisted of the following:

	Years Ended December 31,
	2020		2019
	(in millions)
Total amount of AB Holding Units Purchased (1)	5.4		6.0
Total Cash Paid for AB Holding Units Purchased(1)	$	149.0	$	172.6
Open Market Purchases of AB Holding Units Purchased (2)	3.1		2.9
Total Cash Paid for Open Market Purchases of AB Holding Units (2)	$	74.0	$	82.7

(1) Purchased on a trade date basis.

(2) The remainder related to purchases of AB Holding Units from employees to fulfill statutory tax withholding requirements at the time of delivery of long-term incentive compensation awards.