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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Covid 19 impact (Details) $ / shares in Units, € in Millions, £ in Millions, $ in Millions					1 Months Ended			12 Months Ended
	Feb. 15, 2021 GBP (£)	Feb. 15, 2021 EUR (€)	Jan. 25, 2021 USD ($) shares	Jul. 31, 2020 USD ($)	Jan. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Jul. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Apr. 01, 2022 USD ($)	Apr. 01, 2022 EUR (€)	Mar. 08, 2021 USD ($)	Feb. 15, 2021 USD ($)	Feb. 15, 2021 GBP (£)	Feb. 15, 2021 EUR (€)	Dec. 11, 2020 shares	Nov. 10, 2020 shares	Oct. 20, 2020 shares	Sep. 24, 2020 shares	Apr. 30, 2020 USD ($)	Mar. 31, 2020 $ / shares
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Theatre attendance percentage needed to maintain operations by the fourth quarter 2020 through the first quarter 2022								90.00%
Dividend decrease per share \| $ / shares																						$ 0.17
Payment of deferred financing costs								$ 15.4	$ 11.9	$ 15.5
Debt exchange amount				$ 1,700.0			$ 1,700.0
Amortization of net discount (premium) on corporate borrowings to interest expense								(22.0)	11.3	0.2
Payment of accrued and unpaid interest								15.4	$ 11.9	$ 15.5
Deferred rent obligations						$ 450.0		450.0
Debt Agreement with Mudrick Capital Management, LP [Member]
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount						$ 100.0		100.0
Class A common stock
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Gross proceeds								$ 264.7
Number of shares authorized \| shares						524,173,073		524,173,073	524,173,073
Class A common stock \| Equity Distribution Agreement [Member]
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Number of shares issued \| shares								90,955,685
Gross proceeds								$ 272.8
Sales agents fees paid								$ 8.1
Number of shares authorized \| shares																	178,000,000.0	20,000,000	15,000,000	15,000,000
Class A common stock \| At-the-market equity offerings
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Number of shares issued \| shares					187,000,000.0			91,000,000.0
Gross proceeds					$ 596.9			$ 272.8
Sales agents fees paid					$ 14.9			$ 6.8
Odeon Revolving Credit Facility Due 2022 - 2.5785%
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)						2.5785%		2.5785%
10.5 % First Lien Notes due 2025
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount																					$ 500.0
Stated interest rate (as a percent)																					10.50%
Proceeds from issuance of First Lien Notes								$ 490.0
First Lien Notes due 2026
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Proceeds from issuance of First Lien Notes							270.0
Second Lien Notes due 2026
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount				$ 1,460.0			$ 1,460.0
10.5 % First Lien Notes due 2026
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)				10.50%			10.50%
Proceeds from issuance of First Lien Notes								270.0
Senior Subordinated Notes
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount				$ 1,782.5		$ 235.0	$ 1,782.5	$ 235.0
Amount exchanged							2,020.0
Reduction in principal amount				555.0			555.0
Amount of debt with extended maturities				$ 1,700.0			$ 1,700.0
Second Lien Notes due 2026 \| Class A common stock
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Amount exchanged						$ 104.5
Shares issued on conversion \| shares						21,978,022
2.95% Senior Secured Convertible Notes due 2026
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)					2.95%	2.95%		2.95%	2.95%
Amount exchanged					$ 600.0
2.95% Senior Secured Convertible Notes due 2026 \| Class A common stock
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Shares issued on conversion \| shares					44,422,860
Conversion rate (in dollars per share) \| $ / shares					$ 13.51
Annual cash interest expense					$ 17.7
Senior Secured Credit Facility
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Amount of minimum liquidity requirements											$ 145.0
Aggregate principal amount											100.0
Odean Term Loan Facility
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount											$ 45.0	€ 32.5
Minimum \| Debt Agreement with Mudrick Capital Management, LP [Member]
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)						15.00%		15.00%
Minimum \| Second Lien Notes due 2026
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)				10.00%			10.00%
Minimum \| Senior Subordinated Notes
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Cash savings due to interest paid in cash or in-kind				$ 120.0
Maximum \| Debt Agreement with Mudrick Capital Management, LP [Member]
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)						17.00%		17.00%
Maximum \| Second Lien Notes due 2026
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Stated interest rate (as a percent)				12.00%			12.00%
Maximum \| Senior Subordinated Notes
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Cash savings due to interest paid in cash or in-kind				$ 180.0
Covid 19
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Cash savings from dividend decrease						$ 77.6		$ 77.6
Covid 19 \| Minimum
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Salary reduction percentage								20.00%
Covid 19 \| Maximum
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Salary reduction percentage								100.00%
Subsequent Events \| Class A common stock \| Equity Distribution Agreement [Member]
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Number of shares issued \| shares			50,000,000		187,066,293
Gross proceeds			$ 582.0		$ 596.9
Sales agents fees paid					$ 14.9
Subsequent Events \| Senior Secured Credit Facility
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Amount of minimum liquidity requirements													$ 100.0
Subsequent Events \| Odeon Cinemas Group Limited \| 140.0 million term loan facility agreement
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount														$ 140.0	£ 140.0	€ 140.0
Repayments	£ 89.7	€ 89.7
Subsequent Events \| Odeon Cinemas Group Limited \| 296.0 million term loan facility agreement
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount														296.0		296.0
Repayments \| €		€ 12.8
Subsequent Events \| Odeon Cinemas Group Limited \| Odean Term Loan Facility
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Aggregate principal amount														$ 45.0		€ 32.5
Stated interest rate (as a percent)														10.75%	10.75%	10.75%
Subsequent Events \| Maximum \| Class A common stock \| Equity Distribution Agreement [Member]
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES
Number of shares authorized \| shares			50,000,000