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Related Party Transactions (Summary of Transactions Between the Company and the Founding Members Included in Statements of Income) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jul. 01, 2021
Jun. 30, 2022
Jul. 01, 2021
Related Party Transaction [Line Items]        
Document Period End Date     Jun. 30, 2022  
Revenue $ 67.1 $ 14.0 $ 103.0 $ 19.4
Theater access fees and revenue share to founding members (including fees to related parties of $16.9, $7.1, $29.8, and $8.4, respectively) 23.2 11.2 41.1 14.3
Selling and marketing costs 10.4 8.9 20.6 16.6
Founding Members        
Related Party Transaction [Line Items]        
Revenue 4.6 1.6 7.4 2.0
Theater access fees and revenue share to founding members (including fees to related parties of $16.9, $7.1, $29.8, and $8.4, respectively) 16.9 7.1 29.8 8.4
Theater access fee     29.8 8.4
Operating Costs and Expenses $ 0.0 $ 0.0 $ 0.0 $ 0.1