Investments in 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, 2026
USD ($)
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| Schedule Of Equity Method Investments [Line Items] | |
| Investments, beginning balance | $ 23.9 |
| Equity income | 7.4 |
| Cash distributions received | (6.3) |
| Investments, ending balance | 25.0 |
| AC JV, LLC | |
| Schedule Of Equity Method Investments [Line Items] | |
| Investments, beginning balance | 3.8 |
| Equity income | 6.2 |
| Cash distributions received | (4.3) |
| Investments, ending balance | 5.7 |
| Digital Cinema Distribution Coalition | |
| Schedule Of Equity Method Investments [Line Items] | |
| Investments, beginning balance | 3.5 |
| Equity income | 0.1 |
| Cash distributions received | 0.0 |
| Investments, ending balance | 3.6 |
| FE Concepts, LLC | |
| Schedule Of Equity Method Investments [Line Items] | |
| Investments, beginning balance | 16.6 |
| Equity income | 1.1 |
| Cash distributions received | (2.0) |
| Investments, ending balance | $ 15.7 |
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- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of income (loss) for proportionate share of equity method investee's income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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