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Long-term Incentive Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Compensation Related Costs [Abstract]  
Summary of Activity of Unvested Restricted Holding Units Grant details related to these awards is as follows:
202520242023
Restricted Units Awarded25,518 29,952 30,102 
Weighted Average Grant Date Fair Value$39.98 $34.06 $33.89 
Compensation Expense (in millions)$1.0 $1.0 $1.0 
Grant details related to these awards is as follows:
202520242023
(in millions excluding share prices)
Restricted Units Awarded1.1 1.2 0.5 
Grant Date Fair Value Range
$35.90 - $42.13
$28.46 - $37.26
$27.86 - $38.58
Compensation Expense$19.2 $17.6 $30.1 
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 2025 are as follows:
AB Holding
Units		Weighted Average
Grant Date Fair
Value per AB Holding
Unit
Unvested as of December 31, 202412,419,251 $34.47 
Granted5,847,532 40.04 
Vested(5,642,161)34.79 
Forfeited(400,432)35.10 
Unvested as of December 31, 202512,224,190 $36.96