The accumulated paid in kind interest relating to debt as at the end of the reporting period.

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The closing price of the debt instrument on the day of its offering, used to determine the instrument's fair value.

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Face (par) amount of debt instrument at time of issuance.

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CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Long-term debt and lease obligations (Details) $ / shares in Units, £ in Millions, $ in Millions				12 Months Ended
	Jul. 22, 2024 USD ($)	Feb. 14, 2022 USD ($)	Jul. 31, 2020 USD ($)	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2020	Oct. 15, 2020 USD ($)	Apr. 24, 2020 USD ($)	Mar. 17, 2017 USD ($)	Mar. 17, 2017 GBP (£)	Nov. 08, 2016 USD ($)	Nov. 08, 2016 GBP (£)	Jun. 05, 2015 USD ($)
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 4,134.5	$ 4,504.3
Finance lease liabilities				49.3	55.4
Paid-in-kind interest for 6.00%/8.00% Cash/PIK Toggle Senior Secured Exchangeable Notes due 2030				1.5
Deferred financing costs				(47.2)	(31.1)
Net premium (discount)				(171.3)	104.2
Derivative liability - Conversion Option				157.6
Total carrying value of corporate borrowings and finance lease liabilities				4,124.4	4,632.8
Current maturities of corporate borrowings				(64.2)	(25.1)
Current maturities of finance lease liabilities				(4.4)	(5.4)
Total noncurrent carrying value of corporate borrowings and finance lease liabilities				4,055.8	4,602.3
Corporate borrowings				401.8	369.6	$ 336.4
6.375% Senior Subordinated Notes due 2024
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings					$ 5.1								£ 250.0
Deferred financing costs												$ (12.7)
Stated interest rate (as a percent)			6.375%		6.375%			6.375%	6.375%			6.375%	6.375%	6.375%	6.375%
Debt instrument face amount \| £								£ 4.0					£ 250.0		£ 250.0
5.75% Senior Subordinated Notes due 2025
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 44.1	$ 98.3
Stated interest rate (as a percent)			5.75%	5.75%	5.75%			5.75%								5.75%
Debt instrument face amount																$ 600.0
5.875% Senior Subordinated Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 41.9	$ 51.5
Stated interest rate (as a percent)			5.875%	5.875%	5.875%			5.875%						5.875%	5.875%
Debt instrument face amount														$ 595.0
6.125% Senior Subordinated Notes due 2027
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 125.5	$ 125.5
Deferred financing costs												$ (19.8)
Stated interest rate (as a percent)			6.125%	6.125%	6.125%			6.125%				6.125%	6.125%
Debt instrument face amount												$ 475.0
Senior Subordinated Notes
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Debt instrument face amount			$ 1,782.5	$ 235.0
New Term Loans
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				2,014.2
Net premium (discount)				(43.4)
Debt instrument face amount	$ 1,200.0			$ 2,024.3			$ 793.0
Effective interest rate				11.356%
Odeon Senior Secured Note 2027
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Net premium (discount)				$ (20.9)	$ (26.4)
Stated interest rate (as a percent)				12.75%	12.75%			12.75%
Exchangeable Notes
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings	503.8			$ 445.5
Paid-in-kind interest for 6.00%/8.00% Cash/PIK Toggle Senior Secured Exchangeable Notes due 2030	23.9			1.5
Deferred financing costs	(23.2)			(23.3)
Net premium (discount)	(120.8)			(117.9)
Derivative liability - Conversion Option	$ 233.4			$ 157.6
Interest rate cash (as a percent)	6.00%			6.00%
PIK interest rate (as a percent)	8.00%			8.00%
Debt instrument face amount	$ 414.4			$ 427.6
Closing price	$ 293.6
Effective interest rate	15.12%
Corporate borrowings				18.2
If-converted value in excess of principal				$ 88.3
Price per share (in dollars per share) \| $ / shares				$ 3.98
Second Lien Subordinated Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 574.6
Senior Secured Credit Facility Term Loan Due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings					$ 1,905.0
Net premium (discount)					$ (3.3)
Stated interest rate (as a percent)					8.474%			8.474%
Senior Secured Credit Facility Term Loan Due 2026 \| New Term Loans
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Principal and premium repayments	$ 1,100.0
Odeon Senior Secured Notes Due 2027
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 400.0	$ 400.0
Stated interest rate (as a percent)				12.75%
First Lien Notes due 2029
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 950.0	$ 950.0
Stated interest rate (as a percent)	7.50%	7.50%		7.50%	7.50%			7.50%
Debt instrument face amount		$ 950.0
Second Lien Subordinated Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 131.2	$ 968.9
Net premium (discount)				$ 10.9	$ 133.9
Interest rate cash (as a percent)	10.00%			10.00%	10.00%
PIK interest rate (as a percent)	12.00%			12.00%	12.00%
First Lien Notes due 2025
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total noncurrent carrying value of corporate borrowings and finance lease liabilities										$ 10.0
Stated interest rate (as a percent)		10.50%								10.50%	10.50%
Principal and premium repayments		$ 500.0
Debt instrument face amount											$ 500.0
First Lien Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Stated interest rate (as a percent)		10.50%		10.50%
Debt instrument face amount		$ 300.0	200.0
First Lien Toggle Notes due 2026
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Interest rate cash (as a percent)		15.00%		15.00%
PIK interest rate (as a percent)		17.00%		17.00%
Principal and premium repayments		$ 73.5
First Lien Toggle Notes due 2026 \| Exchangeable Notes
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings				$ 427.6
Second Lien Notes
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS
Total principal amount of corporate borrowings			$ 1,997.4
Stated interest rate (as a percent)			10.00%
PIK interest rate (as a percent)			12.00%
Debt instrument face amount			$ 1,289.1	$ 173.2