v3.26.1
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Long-term debt and lease obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Feb. 24, 2026
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Total principal amount of corporate borrowings $ 4,019.2   $ 4,024.2  
Finance lease liabilities 50.0   52.5  
Accrued paid-in-kind interest 18.1   2.7  
Deferred financing costs (76.7)   (64.4)  
Net discount (64.4)   (68.5)  
Total carrying value of corporate borrowings and finance lease liabilities 4,013.9   4,091.0  
Current maturities of corporate borrowings (19.8)   (19.9)  
Current maturities of finance lease liabilities (5.8)   (5.8)  
Total noncurrent carrying value of corporate borrowings and finance lease liabilities $ 3,988.3   $ 4,065.3  
Credit Agreement-Term Loans due 2029        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Effective interest rate 10.675%   10.731%  
Total principal amount of corporate borrowings $ 1,989.2   $ 1,994.2  
Net discount (29.9)   (32.6)  
Odeon Senior Secured Notes 2027        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Total principal amount of corporate borrowings 400.0   400.0  
Net discount $ (12.8)   $ (14.6)  
Stated interest rate (as a percent) 12.75%   12.75% 12.75%
Senior Secured Exchangeable Notes due 2030        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Effective interest rate 16.54%      
Total principal amount of corporate borrowings $ 155.8   $ 155.8  
Deferred financing costs (12.6)   (14.8)  
Net discount (55.0)   (57.4)  
Bifurcated embedded derivative $ 62.2   $ 131.9  
Interest rate cash (as a percent) 1.50%   1.50%  
Senior Secured Notes due 2029        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Total principal amount of corporate borrowings $ 877.1   $ 877.1  
Net discount $ 59.1   $ 62.5  
Interest rate cash (as a percent) 9.00%   9.00%  
PIK interest rate (as a percent) 6.00%   6.00%  
6.00%/8.00% Cash/PIK Toggle Senior Secured Exchangeable Notes due 2030        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Effective interest rate 15.12%      
Total principal amount of corporate borrowings $ 111.6   $ 111.6  
Accrued paid-in-kind interest 2.6   0.4  
Deferred financing costs (5.1)   (5.2)  
Net discount (25.8)   (26.4)  
Bifurcated embedded derivative $ 5.5   $ 12.6  
Interest rate cash (as a percent) 6.00% 6.00% 6.00%  
PIK interest rate (as a percent) 8.00% 8.00% 8.00%  
First Lien Notes due 2029        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Total principal amount of corporate borrowings $ 360.0   $ 360.0  
Stated interest rate (as a percent) 7.50%   7.50%  
6.125% Senior Subordinated Notes due 2027        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES        
Total principal amount of corporate borrowings $ 125.5   $ 125.5  
Stated interest rate (as a percent) 6.125%   6.125%