STOCKHOLDERS' EQUITY - RSU, PSU and SPSU activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Weighted Average Grant Date Fair Value
Taxes paid for restricted unit withholdings	$ 13.1	$ 52.2
RSU and PSU
Weighted Average Grant Date Fair Value
Taxes paid for restricted unit withholdings	$ 13.1
RSU and PSU \| Class A common stock
Shares of RSU PSU and SPSU
Nonvested at January 1, 2023 (in shares)	3,129,241
Granted (in shares)	2,790,514
Vested (in shares)	(983,107)
Forfeited (in shares)	(29,317)
Cancelled (in shares)	(884,452)
Nonvested at March 31, 2023 (in shares)	4,022,879
Weighted Average Grant Date Fair Value
Nonvested at January 1, 2023 (in dollars per share)	$ 5.91
Granted (in dollars per share)	6.23
Vested (in dollars per share)	5.90
Forfeited (in dollars per share)	5.94
Cancelled (in dollars per share)	5.80
Nonvested at March 31, 2023 (in dollars per share)	$ 6.16
Tranche Years 2024 and 2025 awarded under the 2023 PSU award and Tranche Year 2023 awarded under the 2021 PSU award with grant date fair values to be determined in years 2023 and 2024, respectively	1,107,804
Total Nonvested at March 31, 2023	5,130,683
RSU and PSU \| AMC Preferred Equity Units
Shares of RSU PSU and SPSU
Nonvested at January 1, 2023 (in shares)	3,129,241
Granted (in shares)	3,042,616
Vested (in shares)	(1,246,290)
Forfeited (in shares)	(29,317)
Cancelled (in shares)	(621,269)
Nonvested at March 31, 2023 (in shares)	4,274,981
Weighted Average Grant Date Fair Value
Nonvested at January 1, 2023 (in dollars per share)	$ 5.91
Granted (in dollars per share)	2.22
Vested (in dollars per share)	5.62
Forfeited (in dollars per share)	4.11
Cancelled (in dollars per share)	6.31
Nonvested at March 31, 2023 (in dollars per share)	$ 3.32
Tranche Years 2024 and 2025 awarded under the 2023 PSU award and Tranche Year 2023 awarded under the 2021 PSU award with grant date fair values to be determined in years 2023 and 2024, respectively	1,233,800
Total Nonvested at March 31, 2023	5,508,781
RSU and PSU \| Special Award \| Class A common stock
Shares of RSU PSU and SPSU
Granted (in shares)	2,389,589
Vested (in shares)	(1,284,818)
Cancelled	(1,104,771)
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 6.23
Vested (in dollars per share)	6.23
Cancelled (in dollars per share)	$ 6.23
RSU and PSU \| Special Award \| AMC Preferred Equity Units
Shares of RSU PSU and SPSU
Granted (in shares)	2,389,589
Vested (in shares)	(1,294,464)
Cancelled (in shares)	(1,095,125)
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 2.22
Vested (in dollars per share)	2.22
Cancelled (in dollars per share)	$ 2.22
Special Performance Stock \| Cumulative Adjusted EBITDA Target
Weighted Average Grant Date Fair Value
Percentage of performance target	100.00%
Special Performance Stock \| Cumulative Adjusted Free Cash Flow Target
Weighted Average Grant Date Fair Value
Percentage of performance target	100.00%

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of cancellation.

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Number of equity instruments other than options awarded for the next two fiscal years however the grant date fair values are subject to determination in that particular fiscal year under the share based compensation arrangement.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

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