REVENUE RECOGNITION - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 941.5	$ 1,200.4
Admissions
Disaggregation of Revenue [Line Items]
Revenues	568.0	731.5
Food and beverage
Disaggregation of Revenue [Line Items]
Revenues	288.1	368.8
Total other theatre
Disaggregation of Revenue [Line Items]
Revenues	85.4	100.1
Advertising
Disaggregation of Revenue [Line Items]
Revenues	29.7	34.5
Other theatre
Disaggregation of Revenue [Line Items]
Revenues	55.7	65.6
Products and services transferred at point in time
Disaggregation of Revenue [Line Items]
Revenues	851.8	1,110.0
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	$ 89.7	$ 90.4