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SHAREHOLDERS' DEFICIT - Antara Transactions (Details) - USD ($) $ in Millions					12 Months Ended
	Aug. 28, 2023	Aug. 25, 2023	Feb. 07, 2023	Dec. 22, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
STOCKHOLDERS' EQUITY
Increase in stockholders' deficit					$ 760.3	$ 217.6	$ 1,570.7
Accrued interest paid					421.2	379.0	274.7
Shares issued during period of settlement payment	6,897,018
Convertible Notes due 2026 stock conversion		99,540,642
Net proceeds from AMC Preferred Equity Units issuance					832.7	220.4	1,801.1
Forward purchase agreement
STOCKHOLDERS' EQUITY
Number of shares sold				10,659,511
Value of shares sold				$ 75.1
Increase in stockholders' deficit					193.7
Forward purchase agreement \| Antara Capital LP
STOCKHOLDERS' EQUITY
Gross proceeds			$ 100.0
AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Net proceeds from AMC Preferred Equity Units issuance			$ 75.1		75.1
AMC Preferred Equity Units \| At-the-Market Offerings
STOCKHOLDERS' EQUITY
Value of shares sold							$ 24.2
Gross proceeds					114.5	$ 228.8
AMC Preferred Equity Units \| At-the-Market Offerings \| Antara Capital LP
STOCKHOLDERS' EQUITY
Number of shares sold				6,000,000
Value of shares sold				$ 34.9
Amount reclassified into additional paid-in capital				$ 34.9
AMC Preferred Equity Units \| Forward purchase agreement
STOCKHOLDERS' EQUITY
Number of shares sold				10,659,511
Value of shares sold				$ 75.1
AMC Preferred Equity Units \| Forward purchase agreement \| Antara Capital LP
STOCKHOLDERS' EQUITY
Number of shares sold			19,762,130	10,659,511
Value of shares sold				$ 75.1
Shares issued as consideration				9,102,619
Increase in stockholders' deficit			$ 193.7
Accrued interest paid			1.4
Net proceeds from AMC Preferred Equity Units issuance			75.1
Common Stock \| At-the-Market Offerings
STOCKHOLDERS' EQUITY
Gross proceeds					$ 675.5
Second Lien Notes due 2026
STOCKHOLDERS' EQUITY
Value of shares sold				$ 100.0
Cash interest rate (as a percent)				10.00%
PIK interest rate (as a percent)				12.00%
Convertible Notes due 2026 stock conversion				9,102,619
Second Lien Notes due 2026 \| At-the-Market Offerings \| Antara Capital LP
STOCKHOLDERS' EQUITY
Accrued interest paid			1.4
Second Lien Notes due 2026 \| Forward purchase agreement \| Antara Capital LP
STOCKHOLDERS' EQUITY
Debt instrument face amount			$ 100.0	$ 100.0
Cash interest rate (as a percent)			10.00%	10.00%
PIK interest rate (as a percent)			12.00%	12.00%
Second Lien Notes due 2026 \| AMC Preferred Equity Units \| Forward purchase agreement \| Antara Capital LP
STOCKHOLDERS' EQUITY
Increase in stockholders' deficit			$ 193.7