REVENUE RECOGNITION - Changes in liabilities (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred revenues related to contracts with customers
Beginning balance	$ 412.8
Customer loyalty awards accumulated, net of expirations	62.3	$ 101.6	$ 52.9
Foreign currency translation adjustment, net of tax	(16.5)	(127.7)	131.7
Ending balance	447.1	412.8
Exhibitor Services Agreement
Deferred revenues related to contracts with customers
Beginning balance	$ 564.0	530.9
Cumulative effect of initially applying ASC 606		$ 52.9
Common Unit Adjustment - surrender of common units	1.4	(5.2)
Reclassification revenue, as the result of performance obligations satisfied	$ (15.7)	$ (14.6)
Ending balance	$ 549.7	564.0	530.9
Term of amortization of the exhibitor services agreement (ESA) with NCM	30 years
Accounting Standards Update 2014-09 - Revenue from contracts
Deferred revenues related to contracts with customers
Beginning balance	$ 412.8	376.1
Cumulative effect of initially applying ASC 606		(10.0)
Cash received in advance	457.1	463.4
Customer loyalty awards accumulated, net of expirations		2.8
Foreign currency translation adjustment, net of tax	(3.4)	0.7
Ending balance	447.1	412.8	$ 376.1
Accounting Standards Update 2014-09 - Revenue from contracts \| Admissions
Deferred revenues related to contracts with customers
Customer loyalty awards accumulated, net of expirations	29.4	30.0
Reclassification revenue, as the result of performance obligations satisfied	(307.8)	(329.9)
Accounting Standards Update 2014-09 - Revenue from contracts \| Food and beverage
Deferred revenues related to contracts with customers
Customer loyalty awards accumulated, net of expirations	69.7	55.2
Reclassification revenue, as the result of performance obligations satisfied	(116.7)	(82.3)
Accounting Standards Update 2014-09 - Revenue from contracts \| Total other theatre
Deferred revenues related to contracts with customers
Customer loyalty awards accumulated, net of expirations		8.9
Reclassification revenue, as the result of performance obligations satisfied	(95.6)	(97.0)
Austria theatres \| Accounting Standards Update 2014-09 - Revenue from contracts
Deferred revenues related to contracts with customers
Disposition of Austria theatres	$ (1.2)
Nordic \| Accounting Standards Update 2014-09 - Revenue from contracts
Deferred revenues related to contracts with customers
Business combination - Nordic purchase price allocation		$ (2.3)

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