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Other Investments- Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | $ 25.2 |
Cash distributions received | (1.5) | $ (0.2)
Equity income | (7.5) | $ (22.1)
Investments, ending balance | 26.3 |
AC JV, LLC |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 3.7 |
Cash distributions received | (1.5) |
Equity income | 1.6 |
Other | 0.0 |
Investments, ending balance | 3.8 |
Digital Cinema Distribution Coalition |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 25.2 |
Cash distributions received | (1.5) |
Equity income | 2.8 |
Other | (0.2) |
Investments, ending balance | 26.3 |
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 | 0.1 |
Other | 0.0 |
Investments, ending balance | 1.9 |
Other Affiliates | FE Concepts, LLC |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 19.3 |
Cash distributions received | 0.0 |
Equity income | 1.1 |
Other | 0.0 |
Investments, ending balance | 20.4 |
Other Affiliates | Other Investments |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 0.4 |
Cash distributions received | 0.0 |
Equity income | 0.0 |
Other | (0.2) |
Investments, ending balance | $ 0.2 |

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