Investments in National CineMedia Inc. and Other Affiliates - Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Investment In NCMI
Schedule of Equity Method Investments [Line Items]
Beginning Balance				$ 29.0
Interest accrued related to significant financing component				0.0
Unrealized loss on fair market value adjustment of investment in NCMI		$ 4.3	$ (3.3)	(7.8)	$ 1.1
Amortization of screen advertising advances				0.0
Ending Balance		21.2		21.2
N C M Screen Advertising Advances
Schedule of Equity Method Investments [Line Items]
Beginning Balance	[1]			(318.5)
Interest accrued related to significant financing component	[1]			(10.7)
Unrealized loss on fair market value adjustment of investment in NCMI	[1]			0.0
Amortization of screen advertising advances	[1]			16.3
Ending Balance	[1]	$ (312.9)		$ (312.9)

[1] See “NCM Screen Advertising Advances and Other Deferred Revenue” in Note 4 for the remaining maturity of NCM screen advertising advances as of June 30, 2025.