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STOCKHOLDERS' DEFICIT - At-The-Market Share Issuances (Details) - At-the-Market Offerings - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AMC Preferred Equity Units      
STOCKHOLDERS' EQUITY      
Shares issued   7.1 20.8
Gross proceeds   $ 114.5 $ 228.8
Sales agent fees paid   2.9 5.7
Other third-party issuance costs incurred   8.8 5.5
Other third-party issuance costs paid   $ 11.7 $ 2.7
Common Stock      
STOCKHOLDERS' EQUITY      
Shares issued 75.5 88.0  
Gross proceeds $ 261.8 $ 675.5  
Sales agent fees paid 6.4 16.9  
Other third-party issuance costs incurred 1.9 1.1  
Other third-party issuance costs paid $ 0.8 $ 0.9