v3.23.1
STOCKHOLDERS' EQUITY - Awards granted (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
tranche
$ / shares
shares
Mar. 31, 2022
USD ($)
STOCKHOLDERS' EQUITY    
Stock-based compensation expense | $ $ 25.9 $ 6.5
Conversion of share based payment awards into preferred stock 1  
Conversion ratio of share based payment awards into common stock 1  
Board of Directors    
STOCKHOLDERS' EQUITY    
Stock-based compensation expense | $ $ 0.9 0.8
2023 Performance share award    
STOCKHOLDERS' EQUITY    
Granted (in shares) 942,613  
Stock value | $ $ 3.9  
2022 Performance share award    
STOCKHOLDERS' EQUITY    
Granted (in shares) 461,016  
Stock value | $ $ 1.9  
2021 Performance share award    
STOCKHOLDERS' EQUITY    
Granted (in shares) 1,601,522  
Stock value | $ $ 6.8  
Percentage of performance target 100.00%  
Restricted stock unit    
STOCKHOLDERS' EQUITY    
Stock-based compensation expense | $ $ 3.0 2.8
Restricted stock unit | Members of management and executive officers    
STOCKHOLDERS' EQUITY    
Number of shares to be received for each unit 1  
Performance Vesting | Members of management and executive officers    
STOCKHOLDERS' EQUITY    
Granted (in shares) 942,613  
Number of tranches | tranche 3  
Awards to be granted if target not achieved (in shares) 0  
Performance Vesting | Members of management and executive officers | Minimum    
STOCKHOLDERS' EQUITY    
PSUs vesting as a percentage of performance target 80.00%  
Percentage of performance target 50.00%  
Performance Vesting | Members of management and executive officers | Maximum    
STOCKHOLDERS' EQUITY    
PSUs vesting as a percentage of performance target 120.00%  
Percentage of performance target 200.00%  
Performance stock unit expense    
STOCKHOLDERS' EQUITY    
Stock-based compensation expense | $ $ 1.7 $ 2.9
2013 Equity Incentive Plan | Members of management    
STOCKHOLDERS' EQUITY    
Granted (in shares) 2,827,979  
Grant date fair value (in dollars) | $ $ 11.6  
Vesting period (in years) 3 years  
Vesting rights percentage 33.33%  
2013 Equity Incentive Plan | Stock options | Board of Directors    
STOCKHOLDERS' EQUITY    
Shares granted 85,552  
Grant date fair value | $ $ 0.9  
2013 Equity Incentive Plan | Restricted stock unit | Members of management    
STOCKHOLDERS' EQUITY    
Number of days for settlement 30 days  
2013 Equity Incentive Plan | Performance Vesting | Members of management and executive officers    
STOCKHOLDERS' EQUITY    
Percentage of performance target 100.00%  
Awards to be granted upon achieving 100% of performance target (in shares) 942,613  
Class A common stock    
STOCKHOLDERS' EQUITY    
Price per share (in dollars per share) | $ / shares $ 6.23  
AMC Preferred Equity Units    
STOCKHOLDERS' EQUITY    
Price per share (in dollars per share) | $ / shares $ 2.22  
Conversion ratio of share based payment awards into common stock 1  
AMC Preferred Equity Units | RSU and PSU Units    
STOCKHOLDERS' EQUITY    
Nonvested shares 1,723,830  
AMC Preferred Equity Units | RSU and PSU Units | 2023 Tranche Year    
STOCKHOLDERS' EQUITY    
Nonvested shares 1,149,186  
AMC Preferred Equity Units | RSU and PSU Units | 2024 & 2025 Tranche Year    
STOCKHOLDERS' EQUITY    
Nongranted shares 574,644  
AMC Preferred Equity Units | Restricted stock unit | Members of management and executive officers    
STOCKHOLDERS' EQUITY    
Number of shares to be received for each unit 1  
AMC Preferred Equity Units | 2013 Equity Incentive Plan | Board of Directors    
STOCKHOLDERS' EQUITY    
Shares granted 153,696