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Investments in Affiliates - Summary of Activity for Each of Company's Investments in affiliates (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Schedule Of Equity Method Investments [Line Items]        
Cash distributions received [1] $ (1.6) $ (0.9) $ (1.6) $ (1.5)
Other Affiliates        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     22.6  
Cash distributions received     (1.6)  
Equity income     2.9  
Investments, ending balance 23.9   23.9  
Other Affiliates | AC JV, LLC        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     4.2  
Cash distributions received     (1.6)  
Equity income     1.7  
Investments, ending balance 4.3   4.3  
Other Affiliates | Digital Cinema Distribution Coalition        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     1.8  
Cash distributions received     0.0  
Equity income     0.2  
Investments, ending balance 2.0   2.0  
Other Affiliates | FE Concepts, LLC        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     16.5  
Cash distributions received     0.0  
Equity income     1.0  
Investments, ending balance 17.5   17.5  
Other Affiliates | Other Investments        
Schedule Of Equity Method Investments [Line Items]        
Investments, beginning balance     0.1  
Cash distributions received     0.0  
Equity income     0.0  
Investments, ending balance $ 0.1   $ 0.1  
[1] Reflects cash distributions received from equity investees that were recorded as a reduction of the respective investment balances. These distributions are reported entirely within the U.S. operating segment.