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CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - First and Second Lien Notes due 2026 (Details) $ in Millions									12 Months Ended
	Aug. 25, 2023 shares	Feb. 07, 2023 USD ($) shares	Dec. 22, 2022 USD ($) shares	Feb. 14, 2022	Jun. 01, 2021 shares	Feb. 01, 2021 shares	Jan. 15, 2021 USD ($) item	Jul. 31, 2020 USD ($) item	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
Gain on Extinguishment									$ 142.8	$ (92.8)	$ (14.1)
Interest									421.2	379.0	274.7
Convertible Notes due 2026 stock conversion \| shares	99,540,642
Net proceeds from AMC Preferred Equity Units issuance									832.7	220.4	1,801.1
Increase in stockholders' deficit									760.3	217.6	1,570.7
Accrued interest paid									421.2	379.0	274.7
Forward purchase agreement
Debt Instrument [Line Items]
Principal amount									118.6
Number of shares sold \| shares			10,659,511
Value of shares sold			$ 75.1
Increase in stockholders' deficit									193.7
Second Lien Notes due 2026
Debt Instrument [Line Items]
PIK interest rate (as a percent)			12.00%
Value of shares sold			$ 100.0
Cash interest rate (as a percent)			10.00%
Convertible Notes due 2026 stock conversion \| shares			9,102,619
Second Lien Notes due 2026 \| Nonrelated Party
Debt Instrument [Line Items]
Exercised an option to repurchase									139.7
Repurchase amount									91.4
Gain on Extinguishment									71.3
Interest									4.5
Accrued interest paid									4.5
Second Lien Notes due 2026
Debt Instrument [Line Items]
Gain on Extinguishment									28.3
Aggregate principal amount		$ 100.0
PIK interest rate (as a percent)		12.00%
Aggregate Principal Exchanged									105.3
Accrued Interest Exchanged									$ 1.2
Shares of Common Stock Exchanged \| shares									14,186,651
Interest		$ 1.4
Cash interest rate (as a percent)		10.00%
Increase in stockholders' deficit		$ 193.7
Accrued interest paid		1.4
AMC Preferred Equity Units
Debt Instrument [Line Items]
Consideration received for conversion \| shares						4,610,379
Net proceeds from AMC Preferred Equity Units issuance		$ 75.1							$ 75.1
AMC Preferred Equity Units \| Forward purchase agreement
Debt Instrument [Line Items]
Number of shares sold \| shares			10,659,511
Value of shares sold			$ 75.1
AMC Preferred Equity Units \| Second Lien Notes due 2026
Debt Instrument [Line Items]
Number of shares sold \| shares		19,762,130
Mudrick Capital Management LP
Debt Instrument [Line Items]
Increase in stockholders' deficit											(230.4)
Mudrick Capital Management LP \| Class A common stock
Debt Instrument [Line Items]
Number of shares sold \| shares					850,000
Mudrick Capital Management LP \| AMC Preferred Equity Units
Debt Instrument [Line Items]
Number of shares sold \| shares					850,000
Antara Capital LP \| Second Lien Notes due 2026 \| Forward purchase agreement
Debt Instrument [Line Items]
Aggregate principal amount		$ 100.0	$ 100.0
PIK interest rate (as a percent)		12.00%	12.00%
Cash interest rate (as a percent)		10.00%	10.00%
Antara Capital LP \| Second Lien Notes due 2026 \| Related Party
Debt Instrument [Line Items]
Exercised an option to repurchase									75.9
Repurchase amount									48.5
Gain on Extinguishment									40.9
Interest									1.1
Accrued interest paid									1.1
Antara Capital LP \| 5.875% Senior Subordinated Notes due 2026 \| Related Party
Debt Instrument [Line Items]
Exercised an option to repurchase									4.1
Repurchase amount									1.7
Gain on Extinguishment									2.3
Interest									0.1
Accrued interest paid									0.1
Antara Capital LP \| AMC Preferred Equity Units \| Forward purchase agreement
Debt Instrument [Line Items]
Interest		$ 1.4
Number of shares sold \| shares		19,762,130	10,659,511
Value of shares sold			$ 75.1
Net proceeds from AMC Preferred Equity Units issuance		$ 75.1
Increase in stockholders' deficit		193.7
Accrued interest paid		1.4
Antara Capital LP \| AMC Preferred Equity Units \| Second Lien Notes due 2026 \| Forward purchase agreement
Debt Instrument [Line Items]
Increase in stockholders' deficit		$ 193.7
First Lien Toggle Notes due 2026
Debt Instrument [Line Items]
Exercised an option to repurchase												$ 35.0
Repurchase amount												$ 40.3
Gain on Extinguishment											(14.4)
Aggregate principal amount							$ 100.0
PIK interest rate (as a percent)				17.00%
Number of interest periods \| item							3
First Lien Toggle Notes due 2026 \| Mudrick Capital Management LP
Debt Instrument [Line Items]
Stated interest rate (as a percent)							15.00%
PIK interest rate (as a percent)							17.00%
First Lien Secured Notes Due 2026 \| Class A common stock
Debt Instrument [Line Items]
Reclassified prepaid commitment fee and deferred charges											$ 28.6
Second Lien Notes due 2026
Debt Instrument [Line Items]
Exercised an option to repurchase										118.3
Repurchase amount										68.3
Gain on Extinguishment										(75.0)
Aggregate principal amount								$ 1,289.1	$ 173.2
Stated interest rate (as a percent)								10.00%
PIK interest rate (as a percent)								12.00%
Number of interest periods \| item								3
Principal amount								$ 1,462.3
Interest										4.5
Accrued interest paid										$ 4.5