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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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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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment narratives (Details) € in Millions, £ in Millions, $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 GBP (£)	Mar. 17, 2017 GBP (£)	Nov. 08, 2016 GBP (£)
Impairment losses
Impairment of long-lived assets				$ 77.2	$ 177.9	$ 84.3
Impairment of definite-lived intangible assets					14.4
Impairment of equity method investments recorded in equity in earnings (loss) of non-consolidated entities					8.6
Impairment of other assets recorded in investment expense (income)					15.9	3.6
Impairment of indefinite-lived intangible assets				0.0	15.2	$ 0.0
Goodwill impairment	$ 405.3	$ 156.8	$ 1,744.3		$ 2,306.4
6.375% Senior Subordinated Notes due 2024
Foreign Currency Translation [Abstract]
Aggregate principal amount							€ 4.0	£ 4.0	£ 250.0	£ 250.0
Stated interest rate (as a percent)	6.375%				6.375%	6.375%	6.375%	6.375%	6.375%	6.375%
Domestic theatres
Impairment losses
Impairment of definite-lived intangible assets					$ 14.4
Goodwill impairment					1,276.1
International theatres
Impairment losses
Goodwill impairment					1,030.3
Oden trade name
Impairment losses
Impairment of indefinite-lived intangible assets					12.5
Nordic trade names
Impairment losses
Impairment of indefinite-lived intangible assets					2.7
Nordic trade names \| International theatres
Impairment losses
Impairment of indefinite-lived intangible assets					2.7
U.S.
Impairment losses
Impairment of long-lived assets				$ 61.3	$ 152.5	$ 76.6
Tangible asset impairment, number of theatres \| item				77	101	40
Tangible asset impairment, number of screens \| item				805	1,139	512
Goodwill impairment		151.2	1,124.9
International markets
Impairment losses
Impairment of long-lived assets				$ 15.9	$ 25.4	$ 7.7
Tangible asset impairment, number of theatres \| item				14	37	14
Tangible asset impairment, number of screens \| item				118	340	148
Goodwill impairment	$ 405.3	$ 5.6	$ 619.4