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Investments in National CineMedia Inc. and Other Affiliates - Summary of Activity for Each of Company's Investments in affiliates (Detail) - Other Affiliates [Member]
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Schedule Of Equity Method Investments [Line Items]  
Investments, beginning balance $ 26.2
Equity income 5.1
Cash distributions received (8.0)
Investments, ending balance 23.3
AC JV, LLC  
Schedule Of Equity Method Investments [Line Items]  
Investments, beginning balance 4.1
Equity income 3.4
Cash distributions received (4.0)
Investments, ending balance 3.5
Digital Cinema Distribution Coalition  
Schedule Of Equity Method Investments [Line Items]  
Investments, beginning balance 2.6
Equity income 0.6
Cash distributions received 0.0
Investments, ending balance 3.2
FE Concepts, LLC  
Schedule Of Equity Method Investments [Line Items]  
Investments, beginning balance 19.5
Equity income 1.1
Cash distributions received (4.0)
Investments, ending balance $ 16.6