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THE COMPANY AND SIGNIGICANT ACCOUNTING POLICIES - Forward purchase agreement (Details) - USD ($) $ in Millions			12 Months Ended
	Feb. 07, 2023	Dec. 22, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
STOCKHOLDERS' EQUITY
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
STOCKHOLDERS' EQUITY
Number of shares sold		10,659,511
Value of shares sold		$ 75.1
Increase in stockholders' deficit			193.7
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
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
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
Net proceeds from AMC Preferred Equity Units issuance	$ 75.1
Increase in stockholders' deficit	193.7
Accrued interest paid	1.4
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%
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
Aggregate principal 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