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, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 29, 2022	Mar. 30, 2023
Schedule Of Equity Method Investments [Line Items]
Net Income (Loss)		$ 309.7	$ 188.2	$ (271.2)
N C M I [Member]
Schedule Of Equity Method Investments [Line Items]
Total revenue	$ 34.9				$ 249.2
Operating (loss) income	(30.6)				10.9
Net Income (Loss)	$ (54.0)				$ (69.8)
Current assets						$ 121.7
Noncurrent assets						618.5
Current liabilities						1,204.8
Noncurrent liabilities						67.2
Members' deficit						$ (531.8)