Revenue Recognition - Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025		Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue		$ 540.7		$ 579.2
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		502.6		542.6
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue		38.1	[1]	36.6	[2]
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue	[3]	417.1		457.0
U.S. Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	[4]	394.5		433.8
U.S. Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[2],[4]	22.6		23.2
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue		123.6		122.2
International Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		108.1		108.8
International Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[2]	$ 15.5		$ 13.4

[1] Amount includes amortization of NCM screen advertising advances. See Screen Advertising Advances and Other Deferred Revenue below.

[2] Amount includes amortization of NCM screen advertising advances. See Screen Advertising Advances and Other Deferred Revenue below.

[3] U.S. segment revenue excludes intercompany transactions with the international reportable segment. See Note 16 for the amount of intercompany eliminations for the periods presented.

[4] U.S. segment revenue excludes intercompany transactions with the international reportable segment. See Note 16 for the amount of intercompany eliminations for the periods presented.