Revenue Recognition - Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue		$ 874.8	$ 650.4	$ 2,427.8	$ 1,855.0
Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		831.2	602.7	2,305.7	1,733.2
Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1]	43.6	47.7	122.1	121.8
U.S. Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue	[2]	682.5	511.7	1,896.5	1,484.5
U.S. Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue	[3]	657.4	478.9	1,819.9	1,401.0
U.S. Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1],[3]	25.1	32.8	76.6	83.5
International Operating Segment
Disaggregation of Revenue [Line Items]
Total revenue		192.3	138.7	531.3	370.5
International Operating Segment | Goods and Services Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Total revenue		173.8	123.8	485.8	332.2
International Operating Segment | Goods and Services Transferred Over Time
Disaggregation of Revenue [Line Items]
Total revenue	[1]	$ 18.5	$ 14.9	$ 45.5	$ 38.3

[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.

[3] 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.