STOCKHOLDERS' EQUITY - RSU, PSU and SPSU activity (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Weighted Average Grant Date Fair Value
Taxes paid for restricted unit withholdings	$ 14.2	$ 52.2
RSU and PSU
Weighted Average Grant Date Fair Value
Taxes paid for restricted unit withholdings	$ 14.2
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)	2,790,461
Vested (in shares)	(983,107)
Forfeited (in shares)	(29,317)
Cancelled (in shares)	(884,452)
Nonvested at June 30, 2023 (in shares)	4,022,826
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 June 30, 2023 (in dollars per share)	$ 6.16
Tranche Years 2024 and 2025 awarded under the 2023 PSU award and Tranche Year 2024 awarded under the 2022 PSU award with grant date fair values to be determined in years 2024 and 2025, respectively	1,107,857
Total Nonvested at June 30, 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)	3,042,608
Vested (in shares)	(1,246,290)
Forfeited (in shares)	(29,317)
Cancelled (in shares)	(621,269)
Nonvested at June 30, 2023 (in shares)	4,274,973
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 June 30, 2023 (in dollars per share)	$ 3.32
Tranche Years 2024 and 2025 awarded under the 2023 PSU award and Tranche Year 2024 awarded under the 2022 PSU award with grant date fair values to be determined in years 2024 and 2025, respectively	1,233,808
Total Nonvested at June 30, 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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