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CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Senior Unsecured Convertible Notes narrative (Details) $ / shares in Units, $ in Millions						1 Months Ended	12 Months Ended
	Feb. 14, 2022 USD ($)	Feb. 01, 2021 shares	Jan. 29, 2021 shares	Jul. 31, 2020 USD ($) item	Sep. 14, 2018 shares	Jul. 31, 2020 USD ($) item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 27, 2021 USD ($) $ / shares	Oct. 15, 2020 USD ($)	Apr. 24, 2020 USD ($)
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Long-term Debt, Gross							$ 4,504.3	$ 4,949.0
Amortization of Debt Discount (Premium)							(55.6)	(65.4)	$ (3.9)
Redemption price of debt instrument (as a percent)	107.50%
Restructured amount							238.6
Total noncurrent carrying value of corporate borrowings and finance lease liabilities							4,602.3	5,174.1
Debt issuance costs							31.1	37.9
Interest expense							369.6	336.4	414.9
Other expense							69.1	$ (53.6)	87.9
Class B common stock
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Consideration received for conversion \| shares		4,610,379
AMC Preferred Equity Units
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Consideration received for conversion \| shares		4,610,379
Second Lien Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Long-term Debt, Gross				$ 1,997.4		$ 1,997.4
Amortization of Debt Discount (Premium)				$ 535.1
PIK interest rate				12.00%
Number of interest periods \| item				3		3
Percentage of redemption of debt on aggregate principal amount and accrued and unpaid interest				100.00%
Redemption price of debt instrument (as a percent)				101.00%
Debt instrument face amount				$ 1,289.1		$ 1,289.1	$ 173.2
Percentage of difference between the present value of the old and new cash flows							10.00%
Principal amount				$ 1,462.3
Stated interest rate (as a percent)				10.00%		10.00%
Second Lien Notes due 2026 \| Redemption period one
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Percentage of redemption of debt on aggregate principal amount and accrued and unpaid interest				106.00%
Second Lien Notes due 2026 \| Redemption Period Two
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Percentage of redemption of debt on aggregate principal amount and accrued and unpaid interest				103.00%
Second Lien Notes due 2026 \| Redemption period three
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Percentage of redemption of debt on aggregate principal amount and accrued and unpaid interest				100.00%
Second Lien Notes due 2026 \| At the time of sale of assets
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Redemption price of debt instrument (as a percent)				100.00%
First Lien Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Redemption price of debt instrument (as a percent)				100.00%
Debt instrument face amount	$ 300.0			$ 200.0		$ 200.0
Stated interest rate (as a percent)	10.50%			10.50%		10.50%
First Lien Notes due 2026 \| Class A common stock
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Common Stock, Value, Outstanding				$ 20.2		$ 20.2
First Lien Notes due 2025
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument face amount												$ 500.0
Stated interest rate (as a percent)	10.50%			10.50%		10.50%					10.50%	10.50%
Total noncurrent carrying value of corporate borrowings and finance lease liabilities											$ 10.0
Debt issuance costs												$ 8.9
Senior Subordinated Notes
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument face amount				$ 1,782.5		$ 1,782.5	$ 235.0
2.95% Senior Secured Convertible Notes due 2024
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Restructured amount						$ 600.0
Stated interest rate (as a percent)				2.95%		2.95%
Convertible Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Consideration received for conversion \| shares			4,442,286
Conversion Price \| $ / shares										$ 67.60
Principal balance										$ 600.0
Interest expense									$ 71.0
Convertible Notes due 2026 \| Class B common stock
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Consideration received for conversion \| shares					566,600
Convertible Notes due 2026 \| AMC Preferred Equity Units
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Consideration received for conversion \| shares			4,442,286		566,600