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BASIS OF PRESENTATION - Liquidity (Details) $ in Millions					3 Months Ended				9 Months Ended
BASIS OF PRESENTATION - Liquidity (Details) $ in Millions	Aug. 24, 2023	Feb. 07, 2023 USD ($) shares	Dec. 22, 2022 USD ($) shares	Aug. 04, 2022 shares	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)
BASIS OF PRESENTATION
Common stock dividend declared \| shares				1
Number of shares issued \| shares									40,000,000.0
Net proceeds from AMC Preferred Equity Units issuance									$ 492.4	$ 7.8
Increase in stockholders' deficit					$ 316.5	$ 32.7	$ 70.5	$ 4.3
Conversion ratio	0.1
Stock split conversion ratio	0.1
Amount of minimum liquidity requirements					$ 100.0				100.0
Accrued interest paid									290.0	$ 254.5
Other Third Party Stock Issuance Costs Incurred									0.5
Gross proceeds									325.5
Sales agents fees paid									8.2
Payment to issuance cost to third party									$ 0.1
Percentage of north american box office grosses									0.16
Second Lien Notes due 2026
BASIS OF PRESENTATION
Number of shares sold \| shares			9,102,619
Value of shares sold			$ 100.0
Cash interest rate (as a percent)			10.00%
PIK interest rate (as a percent)			12.00%
Aggregate principal amount		$ 100.0
Second Lien Notes due 2026
BASIS OF PRESENTATION
Cash interest rate (as a percent)		10.00%
PIK interest rate (as a percent)		12.00%
Increase in stockholders' deficit		$ 193.7
Aggregate principal amount		100.0
Accrued interest paid		1.4
AMC Preferred Equity Units
BASIS OF PRESENTATION
Net proceeds from AMC Preferred Equity Units issuance		$ 75.1					75.1
AMC Preferred Equity Units \| Second Lien Notes due 2026
BASIS OF PRESENTATION
Number of shares issued \| shares		19,762,130
AMC Preferred Equity Units \| Second Lien Notes due 2026
BASIS OF PRESENTATION
Number of shares issued \| shares		19,762,130
Forward purchase agreement
BASIS OF PRESENTATION
Number of shares sold \| shares			10,659,511
Value of shares sold			$ 75.1
Increase in stockholders' deficit							$ 193.7
At the Market Offerings
BASIS OF PRESENTATION
Number of shares issued \| shares									40,000,000.0
Other Third Party Stock Issuance Costs Incurred									$ 0.5
Gross proceeds									325.5
Sales agents fees paid									8.2
Payment to issuance cost to third party									$ 0.1
At the Market Offerings \| AMC Preferred Equity Units
BASIS OF PRESENTATION
Number of shares issued \| shares									7,100,000
Other Third Party Stock Issuance Costs Incurred									$ 8.7
Gross proceeds									114.5
Sales agents fees paid									2.9
Payment to issuance cost to third party									$ 11.5