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Revenue Recognition - Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenue $ 857.5 $ 921.8 $ 2,338.7 $ 2,235.2
Goods and Services Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue 810.8 874.1 2,206.5 2,113.2
Goods and Services Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue [1] 46.7 47.7 132.2 122.0
US Reportable Segment        
Disaggregation of Revenue [Line Items]        
Total revenue [2] 683.6 741.4 1,860.0 1,770.4
US Reportable Segment | Goods and Services Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue [3] 656.2 714.6 1,781.6 1,696.1
US Reportable Segment | Goods and Services Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue [1],[3] 27.4 26.8 78.4 74.3
International Reportable Segment        
Disaggregation of Revenue [Line Items]        
Total revenue 173.9 180.4 478.7 464.8
International Reportable Segment | Goods and Services Transferred at a Point in Time        
Disaggregation of Revenue [Line Items]        
Total revenue 154.6 159.5 424.9 417.1
International Reportable Segment | Goods and Services Transferred Over Time        
Disaggregation of Revenue [Line Items]        
Total revenue [1] $ 19.3 $ 20.9 $ 53.8 $ 47.7
[1] Amount includes amortization of NCM screen advertising advances. See NCM Screen Advertising Advances and Other Deferred Revenue below.
[2] U.S. segment revenue excludes intercompany transactions with the international reportable segment. See Note 15 for the amount of intercompany eliminations for the periods presented.
[3] U.S. segment revenue excludes intercompany transactions with the international reportable segment. See Note 15 for the amount of intercompany eliminations for the periods presented.