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INVESTMENTS - Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transactions
Advertising expense	$ 28.0	$ 28.4	$ 10.7
DCM
Related Party Transactions
Receivable due from related party	2.2	2.2
Loan receivable from affiliate	0.6	0.7
DCM \| Other revenues
Related Party Transactions
Related party revenues	17.0	7.8	3.8
DCIP \| Operating expense (income)
Related Party Transactions
Film exhibition costs, Related party		0.2	1.0
AC JV, LLC
Related Party Transactions
Amounts due to affiliate	(2.0)	(3.7)
AC JV, LLC \| Film exhibition costs.
Related Party Transactions
Film exhibition costs, Related party	11.6	10.4	3.9
Screenvision
Related Party Transactions
Receivable due from related party		2.3
Screenvision \| Other revenues
Related Party Transactions
Film exhibition costs, Related party	6.9	4.6	$ 2.6
Nordic
Related Party Transactions
Receivable due from related party	1.3	0.9
Amounts due to affiliate	(1.1)	(1.1)
SCC
Related Party Transactions
Receivable due from related party	1.4	$ 1.3
U.S. theatres and IMAX screen
Related Party Transactions
Amounts due to affiliate	$ (0.7)