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Basis of Presentation and Summary of Significant Accounting Policies (Changes in Equity) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2022
Dec. 30, 2021
Accounting Policies [Abstract]    
Net loss attributable to NCM, Inc. $ (28.7) $ (48.7)
NCM LLC equity issued for purchase of intangible asset 4.9 6.8
Income tax and other impacts of NCM LLC ownership changes 39.8 1.7
NCM, Inc. investment in NCM LLC (12.4) (6.6)
Issuance of shares to founding members 12.0 6.6
Change from net loss attributable to NCM, Inc. and transfers from noncontrolling interests $ 15.6 $ (40.2)