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STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Millions																	1 Months Ended	2 Months Ended	3 Months Ended				12 Months Ended
	Dec. 22, 2022 USD ($) shares	Sep. 26, 2022 USD ($) shares	Aug. 04, 2022 shares	Jun. 03, 2021 USD ($) shares	Jun. 01, 2021 USD ($) shares	Apr. 27, 2021 USD ($) shares	Feb. 01, 2021 shares	Jan. 27, 2021 shares	Jan. 25, 2021 USD ($) shares	Dec. 14, 2020 shares	Dec. 11, 2020 USD ($) shares	Nov. 10, 2020 USD ($) shares	Oct. 20, 2020 USD ($) shares	Sep. 24, 2020 USD ($) shares	Jul. 31, 2020 shares	Feb. 26, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($) shares	Feb. 28, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) item shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares	Apr. 06, 2023 shares	Mar. 15, 2023 shares	Mar. 14, 2023 shares	Mar. 13, 2023 shares
STOCKHOLDERS' EQUITY
Common stock dividend declared			1
Preferred stock authorized																			50,000,000				50,000,000	50,000,000
Preferred stock, unallocated authorized shares																			40,000,000				40,000,000
Gross proceeds \| $																								$ 1,570.7	$ 264.7
Other financing costs \| $																			$ 6.9	$ 0.5	$ 1.8	$ 17.7	$ 26.1	$ 19.9	15.4
Conversion ratio			0.01																1				1
Total estimated unrecognized compensation cost related to nonvested stock-based compensation arrangements \| $																			$ 15.1				$ 15.1
Weighted average period recognized																							1 year 3 months 18 days
Dividends
Common Stock, Cash dividend declared (in dollars per share) \| $ / shares																$ 0.015
Dividends, Cash \| $																$ 3.2
Dividends and dividend equivalents \| $																							$ 0.7		6.5
Accrued unpaid dividends \| $																	$ 0.4								0.4
Subsequent Events
STOCKHOLDERS' EQUITY
Number of shares authorized																											550,000,000	550,000,000	524,173,073
Gross proceeds \| $																		$ 9.6
Number of shares issued																		6,600,000
Sales agents fees paid \| $																		$ 0.2
Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Consideration received for commitment fee										16,483,516
Consideration received for conversion										27,472,528
Forward purchase agreement
STOCKHOLDERS' EQUITY
Number of shares sold	106,595,106
Value of shares sold \| $	$ 75.1
At-the-market equity offerings
STOCKHOLDERS' EQUITY
Number of shares sold	60,000,000
Value of shares sold \| $	$ 34.9
Amount reclassified into additional paid-in capital \| $	$ 34.9
Common Stock and AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Number of votes per share \| item																							1
Common Stock and AMC Preferred Equity Units \| Equity Distribution Agreement
STOCKHOLDERS' EQUITY
Number of shares issued																	40,930,000							137,070,000.00
Sales agents fees paid \| $																							$ 5.7	$ 40.3	8.1
AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Preferred stock authorized																			10,000,000				10,000,000	10,000,000
Preferred stock, shares issued (in shares)																			7,245,872				7,245,872	5,139,791
Preferred stock, unallocated authorized shares																			40,000,000				40,000,000
Other financing costs \| $																					$ 0.7
Number of votes per unit \| item																							1
Consideration received for conversion							46,103,784
Dividends
Preferred Equity, Cash dividend declared (in dollars per share) \| $ / shares																$ 0.015
Dividends and dividend equivalents \| $																									$ 0.8
AMC Preferred Equity Units \| Subsequent Events
STOCKHOLDERS' EQUITY
Preferred stock authorized																										140,000,000.0
AMC Preferred Equity Units \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Number of shares issued										21,978,022
AMC Preferred Equity Units \| Wanda
STOCKHOLDERS' EQUITY
Shares forfeited								5,666,000
AMC Preferred Equity Units \| Equity Distribution Agreement
STOCKHOLDERS' EQUITY
Number of shares authorized											178,000,000.0
Number of shares issued																	40,930,000							137,000,000.0
AMC Preferred Equity Units \| At-the-market equity offerings
STOCKHOLDERS' EQUITY
Number of shares issued		207,750,000		11,550,000		43,000,000.0			50,000,000.0		137,070,000.00	20,000,000.0	15,000,000.0	15,000,000.0			40,930,000						207,750,000	241,620,000	90,930,000
Class A common stock
STOCKHOLDERS' EQUITY
Number of shares authorized																			524,173,073				524,173,073	524,173,073
Consideration received for conversion							46,103,784
Dividends
Common Stock, Cash dividend declared (in dollars per share) \| $ / shares																									$ 0.015
Dividends and dividend equivalents \| $																									$ 0.8
Class A common stock \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Number of shares issued										21,978,022
Consideration received for commitment fee										8,241,758
Class A common stock \| Equity Distribution Agreement
STOCKHOLDERS' EQUITY
Number of shares authorized											178,000,000.0
Other financing costs \| $																								$ 0.8
Class A common stock \| At-the-market equity offerings
STOCKHOLDERS' EQUITY
Gross proceeds \| $		$ 228.8		$ 587.4		$ 427.5			$ 244.3		$ 352.6	$ 61.4	$ 41.6	$ 56.1			$ 113.7						$ 228.8	$ 1,611.8	$ 272.8
Number of shares issued				11,550,000		43,000,000.0			50,000,000.0		137,070,000.00	20,000,000.0	15,000,000.0	15,000,000.0			40,930,000							241,620,000	90,930,000
Reissuance of treasury stock shares						3,700,000
Amount reclassified into additional paid-in capital \| $																								$ 37.1
Amount reclassified into retained earnings \| $																								$ 19.3
Class B common stock
Dividends
Common Stock, Cash dividend declared (in dollars per share) \| $ / shares																									$ 0.015
Dividends and dividend equivalents \| $																									$ 1.6
Class B common stock \| Wanda
STOCKHOLDERS' EQUITY
Shares forfeited								5,666,000
Dividend Equivalents
Dividends
Dividends and dividend equivalents \| $																									$ 3.3
First Lien Notes due 2026 \| AMC Preferred Equity Units
STOCKHOLDERS' EQUITY
Number of Prorata Shares																							5,000,000
First Lien Notes due 2026 \| Class A common stock
STOCKHOLDERS' EQUITY
Number of Prorata Shares															5,000,000								5,000,000
Second Lien Notes due 2026 \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Consideration received for conversion										13,736,264
Second Lien Notes due 2026 \| AMC Preferred Equity Units \| Private Placement \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Number of shares issued					8,500,000
Second Lien Notes due 2026 \| Class A common stock
STOCKHOLDERS' EQUITY
Consideration received for conversion																									137,400,000
Second Lien Notes due 2026
STOCKHOLDERS' EQUITY
Number of shares sold	91,026,191
Value of shares sold \| $	$ 100.0
Second Lien Notes due 2026 \| Private Placement \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Other financing costs \| $					$ 0.1
Second Lien Notes due 2026 \| Class A common stock \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Gross proceeds \| $					$ 230.5
Second Lien Notes due 2026 \| Class A common stock \| Private Placement \| Mudrick Capital Management LP
STOCKHOLDERS' EQUITY
Number of shares issued					8,500,000