Revenue Recognition - Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenue		$ 579.2	$ 610.7
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		542.6	567.0
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1]	36.6	43.7
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue	[2]	457.0	479.1
U.S. Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	[2]	433.8	447.8
U.S. Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1],[2]	23.2	31.3
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue		122.2	131.6
International Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		108.8	119.2
International Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1]	$ 13.4	$ 12.4

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

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