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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value Measurements, Recurring - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investment in NCMI | [1] | $ 30.8 | $ 18.1
Interest rate swap assets | [2] | 2.0 | 9.9
Level 1 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investment in NCMI | [1] | 30.8 | 0.0
Interest rate swap assets | [2] | 0.0 | 0.0
Level 2 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investment in NCMI | [1] | 0.0 | 18.1
Interest rate swap assets | [2] | 2.0 | 9.9
Level 3 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investment in NCMI | [1] | 0.0 | 0.0
Interest rate swap assets | [2] | $ 0.0 | $ 0.0
[1] | See further discussion of investment in NCMI at Note 8.
[2] | See further discussion of interest rate swaps at Note 7.

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