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Related Party Transactions (Summary of Transactions Between the Company and the Founding Members Included in Balance Sheets) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 24, 2020
Dec. 30, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]          
Payment To Founding Members Under Tax Sharing Arrangement   $ (0.9) $ (12.8)    
Document Period End Date       Sep. 30, 2021  
Common unit adjustments, net of amortization and integration payments (included in intangible assets) $ 613.9 613.9     $ 627.8
Current payable to founding members under tax receivable agreement 0.0 0.0     0.9
Long-term payable to founding members under tax receivable agreement 29.3 29.3     32.6
Founding Members          
Related Party Transaction [Line Items]          
Payment To Founding Members Under Tax Sharing Arrangement   0.6 9.0    
Common unit adjustments, net of amortization and integration payments (included in intangible assets) 596.4 596.4     608.1
Current payable to founding members under tax receivable agreement 0.0 0.0     0.6
Long-term payable to founding members under tax receivable agreement 21.3 21.3     23.7
Other Payables to FM 0.0 0.0     $ 0.6
Tax Year 2019 [Member] | Cinemark Holdings Inc [Member]          
Related Party Transaction [Line Items]          
Payment To Founding Members Under Tax Sharing Arrangement $ 0.2   3.2    
Tax Year 2019 [Member] | Regal Entertainment Group [Member]          
Related Party Transaction [Line Items]          
Payment To Founding Members Under Tax Sharing Arrangement   $ 0.4 $ 5.8