Investments in Affiliates - Summary of Activity for Each of Company's Investments in affiliates (Detail) - Other Affiliates [Member] $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	$ 23.6
Cash distributions received	(1.3)
Equity income	3.8
Investments, ending balance	26.1
AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	3.4
Cash distributions received	(1.3)
Equity income	3.3
Investments, ending balance	5.4
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	2.1
Cash distributions received	0.0
Equity income	0.2
Investments, ending balance	2.3
FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	18.1
Cash distributions received	0.0
Equity income	0.3
Investments, ending balance	$ 18.4