The number of screens in theatres for which tangible asset impairment charges were recorded.

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The number of theatres for which tangible asset impairment charges were recorded.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment, Taxes, Insurance (Details) £ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) item	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item	Dec. 31, 2019 GBP (£)	Dec. 31, 2018 GBP (£)	Mar. 17, 2017 GBP (£)	Nov. 08, 2016 GBP (£)
Impairment losses
Impairment of assets \| $		$ 13,800,000	$ 84,300,000	$ 13,800,000	$ 43,600,000
Total impairment loss \| $			87,900,000	$ 13,800,000	$ 43,600,000
Impairment of property \| $			$ 3,600,000
U.S.
Impairment losses
Impairment of assets \| $	$ 84,300,000
Tangible asset impairment, number of theatres	40
Tangible asset impairment, number of screens	512
International markets
Impairment losses
Tangible asset impairment, number of theatres	14
Tangible asset impairment, number of screens	148	118
6.375% Senior Subordinated Notes due 2024
Foreign Currency Translation [Abstract]
Debt instrument face amount \| £						£ 500.0	£ 500.0	£ 250.0	£ 250.0
Stated interest rate (as a percent)					6.375%	6.375%	6.375%	6.375%	6.375%
Impairment Of LongLived Assets
Impairment losses
Tangible asset impairment, number of screens			512
Impairment Of LongLived Assets \| U.S.
Impairment losses
Tangible asset impairment, number of theatres		13	13		12
Tangible asset impairment, number of screens		150	150		179
Impairment Of LongLived Assets \| International markets
Impairment losses
Tangible asset impairment, number of theatres		15	14	15
Tangible asset impairment, number of screens			148	118