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INVESTMENTS (Details) $ / shares in Units, $ in Millions					1 Months Ended		3 Months Ended		12 Months Ended
INVESTMENTS (Details) $ / shares in Units, $ in Millions	Mar. 12, 2021 USD ($) shares	Mar. 12, 2020 $ / shares shares	Mar. 14, 2019 $ / shares shares	Dec. 26, 2013 USD ($) item	Mar. 31, 2020 shares	Mar. 31, 2019 shares	Dec. 31, 2021 USD ($) item	Sep. 30, 2021 item	Dec. 31, 2021 USD ($) item shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)
Investments
Number of Theatres \| item							2	2	3
Recorded equity in (earnings) loss									$ 11.0	$ (30.9)	$ 30.6
Fair value, reduction in investment										8.6
Investments in equity method investees							$ 85.6		85.6	80.9
Amortizable intangible asset							27.6		27.6	29.2
Cash distributions from non-consolidated entities									12.5	$ 17.4	35.8
Exhibitor Services Agreement
Investments
Value of common units returned under Unit Adjustment agreement \| shares										(4,800,000)
Equity Method Investment, Nonconsolidated Investee(s)
Investments
Investments in equity method investees							$ 85.6		$ 85.6	$ 80.9
Europe
Investments
Ownership percentage							50.00%		50.00%
Number of Theatres \| item									57
NCM
Investments
Ownership percentage				4.00%
Common units returned under Common Unit Adjustment Agreement \| shares					1,390,566	197,118
Price per share (in dollars per share) \| $ / shares		$ 3.46	$ 7.24
Equity Method Investments Membership Units Surrendered for Divestiture \| shares	3,012,738
Surrender of common units for transferred theatres	$ 9.2
Cash distribution received									$ 5.7
Equity Method Investments Ownership Transactions [Abstract]
Number of shares sold \| shares									1,400,000
NCM \| Exhibitor Services Agreement
Investments
Value of common units returned under Unit Adjustment agreement \| shares		4,800,000	1,400,000
DCM
Investments
Ownership percentage							50.00%		50.00%
SV Holdco
Investments
Ownership percentage							18.30%		18.30%
SV Holdco \| Class C Units
Investments
Ownership percentage							18.30%		18.30%
AC JV, LLC
Investments
Ownership percentage							32.00%		32.00%
AC JV, LLC \| Founding Members
Investments
Ownership percentage				32.00%
Consideration received for spin-off				$ 25.0
AC JV, LLC \| Founding Members \| 5% Promissory Note payable to NCM due 2019
Investments
Consideration received for spin-off from each founder member				$ 8.3
Number of equal installments of interest and principal payments due \| item				6
Stated interest rate (as a percent)				5.00%
DCIP
Investments
Ownership percentage							29.00%		29.00%
Recorded equity in (earnings) loss									$ (12.2)	14.5	$ (25.4)
Recorded investment reduction									0.0	0.0
Fair value of distribution										125.2
Investments in equity method investees							$ 0.0		0.0	0.0
Equity recorded in net earnings							$ 4.0		4.0	$ 5.1
Cash distributions from non-consolidated entities									$ 12.2
SCC
Investments
Ownership percentage							10.00%		10.00%
U.S. theatres and IMAX screen
Investments
Ownership percentage							50.00%		50.00%
Number of Theatres \| item									3
DCDC
Investments
Ownership percentage							14.60%		14.60%
Minimum \| NCM
Investments
Percentage change in the total annual attendance of all the founding members required to cause an earlier common unit adjustment							2.00%		2.00%
Maximum
Investments
Ownership percentage							50.00%		50.00%