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STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Millions					3 Months Ended
	Feb. 23, 2023 $ / shares shares	Feb. 07, 2023 USD ($) shares	Dec. 22, 2022 USD ($) shares	Aug. 04, 2022 shares	Mar. 31, 2023 USD ($) item $ / shares shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) shares	Sep. 26, 2022 shares	Jan. 19, 2018 item	Jan. 12, 2018 item
STOCKHOLDERS' EQUITY
Common stock dividend declared \| shares				1
Preferred stock authorized \| shares					50,000,000		50,000,000
Preferred stock, unallocated authorized shares \| shares					40,000,000
Conversion ratio				0.01	0.01
Increase in stockholders' deficit					$ 70.5
Carrying value of corporate borrowings					4,740.6		$ 4,949.0
Accrued interest paid					77.3	$ 62.5
Net proceeds from AMC Preferred Equity Units issuance					146.6
Stock-based compensation expense					$ 25.9	6.5
Number of pending actions \| item					2				2	2
Maximum
STOCKHOLDERS' EQUITY
Reserved for future issuance \| shares								425,000,000.0
At the Market Offerings
STOCKHOLDERS' EQUITY
Gross proceeds					$ 80.3
Number of shares issued \| shares					49,300,000
Sales agents fees paid					$ 2.0
other third-party issuance					7.8
Payment to issuance cost to third party					6.8
Forward purchase agreement
STOCKHOLDERS' EQUITY
Value of shares sold			$ 75.1
Increase in stockholders' deficit					$ 193.7
Number of shares sold \| shares			106,595,106
AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Preferred stock authorized \| shares					10,000,000		10,000,000
Preferred stock, shares issued (in shares) \| shares					9,741,909		7,245,872
Preferred stock, unallocated authorized shares \| shares					40,000,000
Price per share (in dollars per share) \| $ / shares					$ 2.22
Net proceeds from AMC Preferred Equity Units issuance		$ 75.1			$ 75.1
Class A common stock
STOCKHOLDERS' EQUITY
Number of shares authorized \| shares					524,173,073		524,173,073
Price per share (in dollars per share) \| $ / shares					$ 6.23
Restricted stock unit
STOCKHOLDERS' EQUITY
Stock-based compensation expense					$ 3.0	2.8
Equity Classified Awards
STOCKHOLDERS' EQUITY
Stock-based compensation expense					25.8	$ 6.5
Special awards expense
STOCKHOLDERS' EQUITY
Expected performance target to be achieved (as a percent)	200.00%
Stock-based compensation expense					20.2
Special awards expense \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Shares vested \| shares	2,389,589
Price per share (in dollars per share) \| $ / shares	$ 2.22
Special awards expense \| Class A common stock
STOCKHOLDERS' EQUITY
Shares vested \| shares	2,389,589
Price per share (in dollars per share) \| $ / shares	$ 6.23
Second Lien Notes due 2026
STOCKHOLDERS' EQUITY
Value of shares sold			$ 100.0
Debt instrument face amount		$ 100.0
Cash interest rate (as a percent)			10.00%
PIK interest rate (as a percent)			12.00%
Number of shares sold \| shares			91,026,191
Second Lien Notes due 2026 \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Number of shares issued \| shares		197,621,297
Second Lien Notes due 2026
STOCKHOLDERS' EQUITY
Debt instrument face amount		$ 100.0
Cash interest rate (as a percent)		10.00%
PIK interest rate (as a percent)		12.00%
Increase in stockholders' deficit		$ 193.7
Carrying value of corporate borrowings					$ 118.6
Accrued interest paid		$ 1.4
Second Lien Notes due 2026 \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Number of shares issued \| shares		197,621,297