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STOCKHOLDERS' EQUITY - Treasury Stock and Stock-based compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 27, 2020
Treasury Stock
Share repurchase program	200,000,000.0
Stock repurchase program period	3 years
Stock Based Compensation Expense
Stock-based compensation expense	$ 22.5	$ 43.1	$ 25.4
Total estimated unrecognized compensation cost related to nonvested stock-based compensation arrangements	$ 15.1
Weighted average period recognized	1 year 3 months 18 days
Board of Directors
Stock Based Compensation Expense
Stock-based compensation expense	$ 0.8	0.9	0.5
Restricted stock unit
Stock Based Compensation Expense
Stock-based compensation expense	13.3	12.6	9.7
Performance stock unit expense
Stock Based Compensation Expense
Stock-based compensation expense	$ 8.4	24.5	1.2
Special Performance Stock Unit
Stock Based Compensation Expense
Stock-based compensation expense		$ 5.1	$ 14.0
Stock options \| 2013 Equity Incentive Plan
2013 Equity Incentive Plan
Number of shares authorized	15,000,000
Number of shares remaining available for grant	4,293,562
Class A common stock
Treasury Stock
Share repurchase program				200,000,000.0
AMC Preferred Equity Units
Treasury Stock
Share repurchase program				200,000,000.0
AMC Preferred Equity Units \| Stock options \| 2013 Equity Incentive Plan
2013 Equity Incentive Plan
Number of shares authorized	7,306,354
Number of shares remaining available for grant	4,293,562