Investments in Affiliates - Summary of Activity for Each of Company's Investments in affiliates (Detail) - Other Affiliates [Member] $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	$ 23.6
Cash distributions received	(2.9)
Equity income	6.3
Investments, ending balance	27.0
AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	3.4
Cash distributions received	(2.9)
Equity income	5.3
Investments, ending balance	5.8
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	2.1
Cash distributions received	0.0
Equity income	0.3
Investments, ending balance	2.4
FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	18.1
Cash distributions received	0.0
Equity income	0.7
Investments, ending balance	$ 18.8