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INVESTMENTS - Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions
Advertising expense	$ 10.7	$ 42.6	$ 45.4
DCM
Related Party Transactions
Amounts due from affiliate		4.2
Loan receivable from affiliate	0.7	0.7
DCM \| Other revenues
Related Party Transactions
Related party revenues	3.8	22.4	20.1
DCIP
Related Party Transactions
Amounts due from affiliate	5.7	3.5
DCIP \| Operating expense
Related Party Transactions
Related party expenses	1.0	3.6	6.5
AC JV, LLC
Related Party Transactions
Amounts due to affiliate	(0.9)	(0.8)
AC JV, LLC \| Film exhibition costs.
Related Party Transactions
Related party expenses	3.9	13.6	12.9
Screenvision
Related Party Transactions
Amounts due from affiliate	0.4	3.4
Screenvision \| Other revenues
Related Party Transactions
Related party expenses	2.6	15.6	$ 15.1
Nordic
Related Party Transactions
Amounts due from affiliate	1.2	2.5
Amounts due to affiliate	(0.5)	(1.6)
SCC
Related Party Transactions
Amounts due from affiliate	0.7	8.3
U.S. theatres and IMAX screen
Related Party Transactions
Amounts due to affiliate	$ (0.4)	$ (1.0)