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INVESTMENTS (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended			6 Months Ended
INVESTMENTS (Details) $ / shares in Units, $ in Millions	Mar. 14, 2022 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($) item	Mar. 31, 2021 item	Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)	Mar. 30, 2022 $ / shares	Dec. 31, 2021 USD ($)
Investments
Recorded equity in (earnings) loss			$ (1.0)	$ (2.7)		$ (6.1)	$ (5.5)
Investments in equity method investees			71.1			71.1			$ 85.6
Cash distributions from non-consolidated entities			0.9			1.6	0.3
Exhibitor Services Agreement
Investments
Value of common units returned under Unit Adjustment agreement						$ (15.0)
U.S.
Investments
Number of Theatres \| item				593	585
Number of theatres with partnership interests \| item						3
Europe
Investments
Number of theatres with partnership interests \| item						57
NCM
Investments
Common units returned under Common Unit Adjustment Agreement \| shares		5,954,646
Price per share (in dollars per share) \| $ / shares								$ 2.52
Equity Method Investments Ownership Transactions [Abstract]
Unrealized loss (gain) on investments			(9.6)			$ (9.5)	1.2
NCM \| Exhibitor Services Agreement
Investments
Value of common units returned under Unit Adjustment agreement		$ 15.0
Hycroft
Equity Method Investments Ownership Transactions [Abstract]
Cost of investment	$ 27.9
Number of shares purchased \| shares	23,400,000
Stock split conversion ratio	1
Price per unit in equity method investment \| $ / shares	$ 1.193
Number of shares to be received for each unit \| shares	1
Unrealized loss (gain) on investments						16.1
Hycroft \| Investment Income
Equity Method Investments Ownership Transactions [Abstract]
Unrealized loss (gain) on investments			$ (47.8)			$ 16.1
57 Theatres \| Europe
Investments
Ownership percentage			50.00%			50.00%
Investment in Hycroft Mining Holding Corporation Warrants
Investments
Price per share (in dollars per share) \| $ / shares	$ 1.068
Equity Method Investments Ownership Transactions [Abstract]
Number of shares to be received for each unit \| shares	1
Term	5 years
Non consolidated investee
Investments
Recorded equity in (earnings) loss			$ 1.0	$ 2.7		$ 6.1	$ 5.5
DCM
Investments
Ownership percentage			50.00%			50.00%
SV Holdco
Investments
Ownership percentage			18.40%			18.40%
AC JV, LLC
Investments
Ownership percentage			32.00%			32.00%
DCIP
Investments
Ownership percentage			29.00%			29.00%
SCC
Investments
Ownership percentage			10.00%			10.00%
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%