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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Investments, Goodwill, Payables, Leases (Details) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Investments
Impairment of definite-lived intangible assets						$ 14.4
Impairment of indefinite-lived intangible assets				$ 0.0	$ 0.0	15.2
Number of theatres \| item				3
Number of reporting units \| item				2
Goodwill	$ 2,547.3			$ 2,342.0	2,429.8	2,547.3
Goodwill impairment						2,306.4
Accounts payable related to checks issued but not yet presented to bank				$ 2.2	3.6
Optional renewal term, operating lease				20 years
U.S.
Investments
Goodwill	1,796.5			$ 1,796.5	1,796.5	1,796.5
Goodwill impairment		$ 151.2	$ 1,124.9
International markets
Investments
Goodwill	750.8			$ 545.5	$ 633.3	$ 750.8
Goodwill impairment	$ 405.3	$ 5.6	$ 619.4
Nordic.
Investments
Number of theatres \| item				57
Minimum
Investments
Initial base terms of operating leases				12 years
Operating lease, remaining lease term				1 year
Maximum
Investments
Initial base terms of operating leases				15 years
Operating lease, remaining lease term				25 years
SV Holdco
Investments
Ownership percentage				18.30%
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%
SCC
Investments
Ownership percentage				10.00%
U.S. theatres and IMAX screen
Investments
Ownership percentage				50.00%
Number of theatres \| item				3
57 Theatres \| Nordic.
Investments
Ownership percentage				50.00%