CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	[1]	$ 2,376.7	$ 2,329.3
CUSA [Member]
Treasury stock		57,245	57,245
CUSA [Member] | Class A Common Stock
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares authorized		10,000,000	10,000,000
Common stock, shares issued		1,500	1,500
Common stock, shares outstanding		1,500	1,500
CUSA [Member] | Class B Common Stock
Common stock, par value		$ 0	$ 0
Common stock, shares authorized		1,000,000	1,000,000
Common stock, shares issued		239,893	239,893
Common stock, shares outstanding		182,648	182,648
CNK [Member]
Common stock, par value		$ 0.001	$ 0.001
Common stock, shares authorized		300,000,000	300,000,000
Common stock, shares issued		128,700,226	127,598,774
Common stock, shares outstanding		122,321,734	121,596,206
Treasury stock		6,378,492	6,002,568

[1] Amortization of finance lease assets is included in depreciation and amortization expense on the consolidated statements of income (loss). Accumulated amortization of finance lease assets as of December 31, 2023 and 2024 was $73.9 and $58.4, respectively.