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STOCKHOLDERS' EQUITY (Details) $ in Millions											3 Months Ended				9 Months Ended
STOCKHOLDERS' EQUITY (Details) $ in Millions	Aug. 28, 2023 shares	Aug. 25, 2023 shares	Aug. 24, 2023	Aug. 11, 2023	Apr. 02, 2023	Mar. 14, 2023 shares	Feb. 23, 2023 shares	Feb. 07, 2023 USD ($) shares	Dec. 22, 2022 USD ($) shares	Aug. 04, 2022 shares	Sep. 30, 2023 USD ($) item shares	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item shares	Sep. 30, 2022 USD ($)	Sep. 06, 2023 shares	Mar. 13, 2023 shares	Dec. 31, 2022 shares	Sep. 26, 2022 shares	Jan. 19, 2018 item	Jan. 12, 2018 item
STOCKHOLDERS' EQUITY
Common stock dividend declared \| shares										1
Gross proceeds															$ 325.5
Number of shares issued \| shares															40,000,000.0
Sales agents fees paid															$ 8.2
other third-party issuance															0.5
Payment to issuance cost to third party															0.1
Conversion ratio			0.1
Conversion of Convertible Securities into common stock \| shares		99,540,642
Increase in stockholders' deficit											$ 316.5	$ 32.7	$ 70.5	$ 4.3
Accrued interest paid															290.0	$ 254.5
Net proceeds from AMC Preferred Equity Units issuance															$ 492.4	$ 7.8
Number of pending actions \| item											2				2						2	2
Shares issued during period of settlement payment \| shares	6,897,018
Preferred stock, share authorized (in shares) \| shares											50,000,000				50,000,000				50,000,000
Stock split conversion ratio			0.1
Maximum
STOCKHOLDERS' EQUITY
Reserved for future issuance \| shares																	40,000,000.0			42,500,000
At the Market Offerings
STOCKHOLDERS' EQUITY
Gross proceeds															$ 325.5
Number of shares issued \| shares															40,000,000.0
Sales agents fees paid															$ 8.2
other third-party issuance															0.5
Payment to issuance cost to third party															$ 0.1
Forward purchase agreement
STOCKHOLDERS' EQUITY
Value of shares sold									$ 75.1
Increase in stockholders' deficit													193.7
Number of shares sold \| shares									10,659,511
Shareholder Litigation
STOCKHOLDERS' EQUITY
Stock split conversion ratio				0.1333	0.1333
AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Preferred stock, shares issued (in shares) \| shares											0				0				7,245,872
Net proceeds from AMC Preferred Equity Units issuance								$ 75.1					$ 75.1
Preferred stock, share authorized (in shares) \| shares											0				0				10,000,000
AMC Preferred Equity Units \| At the Market Offerings
STOCKHOLDERS' EQUITY
Gross proceeds															$ 114.5
Number of shares issued \| shares															7,100,000
Sales agents fees paid															$ 2.9
other third-party issuance															8.7
Payment to issuance cost to third party															$ 11.5
Class A common stock
STOCKHOLDERS' EQUITY
Number of shares authorized \| shares											550,000,000				550,000,000				524,173,073
Special awards expense
STOCKHOLDERS' EQUITY
Expected performance target to be achieved (as a percent)							200.00%
Special awards expense \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Shares vested \| shares							238,959
Special awards expense \| Class A common stock
STOCKHOLDERS' EQUITY
Shares vested \| shares							238,959
Special Meeting of Stockholders
STOCKHOLDERS' EQUITY
Number of shares authorized \| shares						550,000,000												524,173,073
Stock split conversion ratio						1
Second Lien Notes due 2026
STOCKHOLDERS' EQUITY
Value of shares sold									$ 100.0
Conversion of Convertible Securities into common stock \| shares									9,102,619
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									9,102,619
Second Lien Notes due 2026 \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Number of shares issued \| shares								19,762,130
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
Accrued interest paid								$ 1.4
Second Lien Notes due 2026 \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Number of shares issued \| shares								19,762,130