Revenue Recognition - Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue		$ 734.2	$ 942.3	$ 1,313.4	$ 1,553.0
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		696.5	907.5	1,239.1	1,474.5
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1]	37.7	34.8	74.3	78.5
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue	[2]	572.0	734.9	1,029.0	1,214.0
U.S. Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	[2]	547.7	714.7	981.5	1,162.5
U.S. Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1],[2]	24.3	20.2	47.5	51.5
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue		162.2	207.4	284.4	339.0
International Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		148.8	192.8	257.6	312.0
International Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1]	$ 13.4	$ 14.6	$ 26.8	$ 27.0

[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.