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CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - First and Second Lien Notes due 2026 (Details) $ in Millions							1 Months Ended	12 Months Ended
	Dec. 06, 2024 shares	Aug. 25, 2023 shares	Feb. 07, 2023 USD ($) shares	Dec. 22, 2022 USD ($) shares	Feb. 14, 2022	Jul. 31, 2020 USD ($) item	Jan. 31, 2025 shares	Dec. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 05, 2015 USD ($)
Debt Instrument [Line Items]
Gain on Extinguishment								$ 38.9	$ 142.8	$ (92.8)
Interest								401.6	421.2	379.0
Conversion of convertible securities (in shares) \| shares		99,540,642
Accrued interest paid								$ 401.6	421.2	$ 379.0
Forward purchase agreement
Debt Instrument [Line Items]
Shares issued \| shares	30,000,000
Principal amount									$ 118.6
Subsequent Events \| Forward purchase agreement
Debt Instrument [Line Items]
Shares issued \| shares							30,000,000
5.75% Senior Subordinated Notes due 2025
Debt Instrument [Line Items]
Aggregate principal amount											$ 600.0
Stated interest rate (as a percent)						5.75%		5.75%	5.75%		5.75%
Antara Capital LP \| Second Lien Notes \| Forward purchase agreement
Debt Instrument [Line Items]
Aggregate principal amount			$ 100.0	$ 100.0
PIK interest rate (as a percent)			12.00%	12.00%
Interest			$ 1.4
Cash interest rate (as a percent)			10.00%	10.00%
Accrued interest paid			$ 1.4
Antara Capital LP \| AMC Preferred Equity Units \| Forward purchase agreement
Debt Instrument [Line Items]
Number of shares sold \| shares			19,762,130	10,659,511
Value of shares sold				$ 75.1
Antara Capital LP \| AMC Preferred Equity Units \| Second Lien Notes \| Forward purchase agreement
Debt Instrument [Line Items]
Increase in stockholders' deficit			$ 193.7
First Lien Toggle Notes due 2026
Debt Instrument [Line Items]
Interest rate cash (as a percent)					15.00%			15.00%
Number Of Interest Periods \| item								3
PIK interest rate (as a percent)					17.00%			17.00%
Second Lien Notes
Debt Instrument [Line Items]
Aggregate principal amount						$ 1,289.1		$ 173.2
Stated interest rate (as a percent)						10.00%
PIK interest rate (as a percent)						12.00%
Number of interest periods \| item						3
Principal amount						$ 1,462.3