Revenue from Contracts with Customers and Accounts Receivable - Summary of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 01, 2026	Sep. 25, 2025	Oct. 01, 2026	Sep. 25, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 61.4	$ 63.4	$ 153.8	$ 150.0
Cinema advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	55.3	59.5	141.5	139.3
Office/residential advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	2.2	0.0	2.2	0.0
Other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 3.9	$ 3.9	$ 10.1	$ 10.7

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.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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