INVESTMENT IN NATIONAL CINEMEDIA, INC / NATIONAL CINEMEDIA LLC - Summary Financial Information for National CineMedia (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023		Dec. 31, 2023	Dec. 31, 2022	Dec. 29, 2022	Dec. 31, 2021	Dec. 30, 2021
Schedule Of Equity Method Investments [Line Items]
Net Income (Loss)			$ 188.2	$ (271.2)		$ (422.8)
N C M I [Member]
Schedule Of Equity Method Investments [Line Items]
Revenues	$ 34.9	[1]			$ 249.2		$ 114.6
Operating (loss) income	(30.6)	[1]			10.9		(68.6)
Net Income (Loss)	(54.0)	[1]			(69.8)		$ (134.6)
Current assets	121.7	[2]			148.6
Noncurrent assets	618.5	[2]			628.2
Current liabilities	1,204.8	[2]			97.5
Noncurrent liabilities	67.2	[2]			1,161.6
Members' deficit	$ (531.8)	[2]			$ (482.3)

[1] Financial information for NCMI is presented for the latest reporting period available through which the Company accounted for its investment in NCMI under the equity method.

[2] Financial information for NCMI is presented for the latest reporting period available through which the Company accounted for its investment in NCMI under the equity method.