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Long-term Incentive Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Compensation Related Costs [Abstract]  
Schedule of Activity of Unvested Restricted Holding Units Grant details related to these awards is as follows:
202420232022
Restricted Units Awarded29,952 30,102 30,870 
Weighted Average Grant Date Fair Value$34.06 $33.89 $38.55 
Compensation Expense (in millions)$1.0 $1.0 $1.2 
Grant details related to these awards is as follows:
202420232022
(in millions excluding share prices)
Restricted Units Awarded1.2 0.5 0.5 
Grant Date Fair Value Range
$28.46 - $37.26
$27.86 - $38.58
$34.86 - $49.90
Compensation Expense$17.6 $30.1 $35.0 
The fair value of the restricted AB Holding Units is amortized over the requisite service period as compensation expense. Changes in unvested restricted AB Holding Units during 2024 are as follows:
AB Holding
Units		Weighted Average
Grant Date Fair
Value per AB Holding
Unit
Unvested as of December 31, 202313,447,555 $35.02 
Granted5,922,324 35.29 
Vested(6,740,540)36.26 
Forfeited(210,088)35.15 
Unvested as of December 31, 202412,419,251 $34.47