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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Investments, Goodwill, Payables, Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investments
Impairment of indefinite-lived intangible assets	$ 0.0	$ 0.0	$ 0.0
Number of theatres \| item	4
Number of reporting units \| item	2
Goodwill	$ 2,358.7	2,342.0	2,429.8
Accounts payable related to checks issued but not yet presented to bank	3.0	2.2
U.S.
Investments
Goodwill	1,796.5	1,796.5	1,796.5
International markets
Investments
Goodwill	$ 562.2	$ 545.5	$ 633.3
Nordic.
Investments
Number of theatres \| item	61
SV Holdco
Investments
Ownership percentage	18.40%
SV Holdco \| Class C Units
Investments
Ownership percentage	18.30%
DCM
Investments
Ownership percentage	50.00%
AC JV, LLC
Investments
Ownership percentage	32.00%
DCDC
Investments
Ownership percentage	14.60%
U.S. theatres and IMAX screen
Investments
Ownership percentage	50.00%
Number of theatres \| item	4
Theatres \| Nordic.
Investments
Ownership percentage	50.00%