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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, 2025
Dec. 31, 2024
Dec. 31, 2023
AMC Preferred Equity Units      
STOCKHOLDERS' EQUITY      
Shares issued through at-the-market offering     7.1
At-the-market offering gross proceeds     $ 114.5
Sales agent fees paid     2.9
Other third-party issuance costs incurred     8.8
Other third-party issuance costs paid     $ 11.7
Common Stock      
STOCKHOLDERS' EQUITY      
Shares issued through at-the-market offering 17.1 75.5 88.0
At-the-market offering gross proceeds $ 63.0 $ 261.8 $ 675.5
Sales agent fees paid 0.6 6.4 16.9
Other third-party issuance costs incurred 0.3 1.9 1.1
Other third-party issuance costs paid $ 1.5 $ 0.8 $ 0.9