v3.25.4
STOCKHOLDERS' DEFICIT - Awards granted (Details)
$ in Millions
12 Months Ended
Feb. 19, 2025
shares
Feb. 22, 2024
shares
Aug. 25, 2023
shares
Feb. 23, 2023
USD ($)
shares
Dec. 31, 2025
USD ($)
item
tranche
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
STOCKHOLDERS' EQUITY              
Conversion of convertible securities (in shares)     99,540,642        
Stock-based compensation expense | $         $ 16.9 $ 22.0 $ 42.5
Conversion ratio of share based payment awards into common stock         1    
Board of Director              
STOCKHOLDERS' EQUITY              
Stock-based compensation expense | $         $ 1.3 $ 1.0 $ 0.9
Restricted stock unit              
STOCKHOLDERS' EQUITY              
Vesting period (in years)         3 years 3 years 3 years
Vesting rights percentage         33.00% 33.00% 33.00%
Number of days from the termination of service for settlement of fully vested units         30 days    
Shares vested         479,247    
Stock-based compensation expense | $         $ 13.4 $ 12.3 $ 14.3
Performance Vesting              
STOCKHOLDERS' EQUITY              
Shares vested         682,193    
Performance Vesting | Members of management and executive officers              
STOCKHOLDERS' EQUITY              
Number of tranches | tranche         3    
Number of performance targets | item         3    
Performance Vesting | Members of management and executive officers | Minimum              
STOCKHOLDERS' EQUITY              
Percentage of performance target         50.00%    
Number of strategic initiatives | item         3    
Number of strategic initiatives vesting of second tranche         4    
Performance Vesting | Members of management and executive officers | Maximum              
STOCKHOLDERS' EQUITY              
Percentage of performance target         200.00%    
Number of strategic initiatives | item         7    
Number of strategic initiatives vesting of second tranche         10    
Special award              
STOCKHOLDERS' EQUITY              
Shares vested 270,093 478,055          
Expected performance target to be achieved (as a percent) 146.00% 200.00%   200.00%      
Stock-based compensation expense | $         $ 1.0 $ 2.1 $ 20.2
Cash settled units              
STOCKHOLDERS' EQUITY              
Shares vested 4,181 21,829          
Equity settled units              
STOCKHOLDERS' EQUITY              
Shares vested 265,912 456,226          
Members of management and executive officers | Performance Vesting | Minimum              
STOCKHOLDERS' EQUITY              
PSUs vesting as a percentage of performance target         80.00%    
Percentage of performance target         50.00%    
Members of management and executive officers | Performance Vesting | Maximum              
STOCKHOLDERS' EQUITY              
PSUs vesting as a percentage of performance target         120.00%    
Percentage of performance target         200.00%    
Common Stock | Board of Director              
STOCKHOLDERS' EQUITY              
Shares issued through at-the-market offering         370,586 202,392 8,560
Class A common stock | Special award              
STOCKHOLDERS' EQUITY              
Shares vested       238,959      
Stock-based compensation expense | $       $ 14.9      
AMC Preferred Equity Units | Special award              
STOCKHOLDERS' EQUITY              
Shares vested       238,959      
Stock-based compensation expense | $       $ 5.3      
AMC Preferred Equity Units | Board of Director              
STOCKHOLDERS' EQUITY              
Shares issued through at-the-market offering             15,376