INCOME TAXES - Tax Effects of Significant Temporary Differences and Tax Loss and Tax Credit Carryforwards (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Theatre properties and equipment	$ 56.7	$ 68.4
Finance lease assets	22.4	13.3
Operating lease right-of-use assets	232.6	248.8
Intangible asset — other	57.4	55.8
Intangible asset — tradenames	69.5	69.5
Total deferred liabilities	438.6	455.8
Gift Cards	10.8	9.7
Operating lease obligations	249.0	269.0
Finance lease obligations	27.9	18.6
Tax impact of items in accumulated other comprehensive income and additional paid-in-capital	10.3	13.4
Restricted stock	6.1	4.5
Other tax loss carryforwards	65.8	82.7
Other tax credit and attribute carryforwards	167.9	179.3
Other expenses, not currently deductible for tax purposes	13.6	18.7
Total deferred assets	634.4	678.1
Net deferred income tax asset before valuation allowance	(195.8)	(222.3)
Valuation allowance against deferred assets – non-current	129.5	266.3
Net deferred income tax liability (asset)	(66.3)	44.0
CUSA
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Theatre properties and equipment	56.6	68.2
Finance lease assets	22.4	13.2
Operating lease right-of-use assets	232.3	248.1
Intangible asset — other	57.3	55.7
Intangible asset — tradenames	69.4	69.3
Tax impact of items in accumulated other comprehensive income and additional paid-in-capital	0.0	1.4
Total deferred liabilities	438.0	455.9
Deferred revenue - NCM and other	82.8	82.0
Gift Cards	10.8	9.7
Operating lease obligations	248.7	268.3
Finance lease obligations	27.9	18.6
Tax impact of items in accumulated other comprehensive income and additional paid-in-capital	3.5	0.0
Restricted stock	5.9	4.3
Other tax loss carryforwards	63.1	80.0
Other tax credit and attribute carryforwards	128.1	149.0
Other expenses, not currently deductible for tax purposes	13.5	18.5
Total deferred assets	584.3	630.4
Net deferred income tax asset before valuation allowance	(146.3)	(174.5)
Valuation allowance against deferred assets – non-current	83.7	218.5
Net deferred income tax liability (asset)	(62.6)	44.0
NCM
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Deferred revenue - NCM and other	83.0	82.2
Foreign
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Valuation allowance against deferred assets – non-current	36.5
Net deferred tax asset	(32.4)	(0.1)
Foreign | CUSA
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Valuation allowance against deferred assets – non-current	36.5
Net deferred tax asset	(32.4)	(0.1)
U.S.
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Net deferred income tax liability (asset)	(33.9)	44.1
U.S. | CUSA
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Net deferred income tax liability (asset)	$ (30.2)	$ 44.1