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Investments in National CineMedia Inc. and Other Affiliates - Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investment In NCMI        
Schedule of Equity Method Investments [Line Items]        
Beginning Balance     $ 29.0  
Interest accrued related to significant financing component     0.0  
Unrealized loss on fair market value adjustment of investment in NCMI $ 1.5 $ 11.6 (9.3) $ 12.7
Amortization of screen advertising advances     0.0  
Ending Balance 19.7   19.7  
N C M Screen Advertising Advances        
Schedule of Equity Method Investments [Line Items]        
Beginning Balance [1]     (318.5)  
Interest accrued related to significant financing component [1]     (16.0)  
Unrealized loss on fair market value adjustment of investment in NCMI [1]     0.0  
Amortization of screen advertising advances [1]     24.4  
Ending Balance [1] $ (310.1)   $ (310.1)  
[1] See “NCM Screen Advertising Advances and Other Deferred Revenue” in Note 4 for the remaining maturity of NCM screen advertising advances as of September 30, 2025.