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Other Investments- Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | $ 25.2 |
Cash distributions received | (0.6) | $ (0.2)
Equity in loss of affiliates | (2.2) | $ (6.8)
Investments, ending balance | 25.8 |
Other Affiliates |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 25.2 |
Cash distributions received | (0.6) |
Equity in loss of affiliates | 1.3 |
Other | (0.1) |
Investments, ending balance | 25.8 |
Other Affiliates | AC JV, LLC |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 3.7 |
Cash distributions received | (0.6) |
Equity in loss of affiliates | 1.0 |
Investments, ending balance | 4.1 |
Other Affiliates | Digital Cinema Distribution Coalition |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 1.8 |
Equity in loss of affiliates | 0.1 |
Investments, ending balance | 1.9 |
Other Affiliates | FE Concepts, LLC |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 19.3 |
Equity in loss of affiliates | 0.2 |
Investments, ending balance | 19.5 |
Other Affiliates | Other Investments |  |
Schedule Of Equity Method Investments [Line Items] |  |
Investments, beginning balance | 0.4 |
Other | (0.1) |
Investments, ending balance | $ 0.3 |

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