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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
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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

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