Income Taxes (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Oct. 21, 2024
Tax Credit Carryforward [Line Items]
Income tax examination estimate of assessed amount before interest and penalties					$ 96.8
CNK [Member]
Tax Credit Carryforward [Line Items]
Income tax expense (benefit)	$ 42.7	$ (21.4)	$ 71.3	$ (29.8)
Effective income tax rate			(37.60%)
Deferred tax benefit	70.5		$ 116.3
Remaining valuation allowance	134.3		134.3
CUSA [Member]
Tax Credit Carryforward [Line Items]
Income tax expense (benefit)	39.7	$ (17.4)	$ 67.6	$ (24.2)
Effective income tax rate			(33.70%)
Deferred tax benefit	66.7		$ 112.4
Remaining valuation allowance	$ 87.4		$ 87.4