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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Investments, Goodwill, Other Long-term Assets, Payables, Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Investments
Impairment of indefinite-lived intangible assets	$ 0.0	$ 0.0	$ 0.0
Number of reporting units \| item	2
Gain on derivative liability	$ (75.8)
Goodwill	2,301.1	2,358.7	2,342.0
Capitalized computer software amortization	23.3	25.4	34.4
Accounts payable related to checks issued but not yet presented to bank	0.1	3.0
U.S. Markets
Investments
Goodwill	1,796.5	1,796.5	1,796.5
International Markets
Investments
Goodwill	$ 504.6	$ 562.2	$ 545.5
SV Holdco LLC, owner of Screen vision
Investments
Ownership Interest	18.40%
Digital Cinema Media Ltd. ("DCM")
Investments
Ownership Interest	50.00%
AC JV
Investments
Ownership Interest	32.00%
Digital Cinema Distribution Coalition, LLC ("DCDC")
Investments
Ownership Interest	14.60%