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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.

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