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OPERATING SEGMENT (Details) $ in Millions	3 Months Ended								12 Months Ended
OPERATING SEGMENT (Details) $ in Millions	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
OPERATING SEGMENT
Number of reportable segments \| segment									2
Revenue	$ 1,447.7	$ 1,316.8	$ 1,506.1	$ 1,200.4	$ 1,413.3	$ 1,221.4	$ 1,442.5	$ 1,383.6	$ 5,471.0	$ 5,460.8	$ 5,079.2
Long-term assets, net	13,002.7				8,714.5				13,002.7	8,714.5
Adjusted EBITDA									771.4	929.2	822.5
Capital expenditures									518.1	576.3	626.8
U.S.
OPERATING SEGMENT
Revenue									4,023.2	4,013.2	3,723.5
Long-term assets, net	9,039.6				5,826.5				9,039.6	5,826.5
Adjusted EBITDA									575.6	700.5	610.0
Capital expenditures									369.4	395.6	543.7
International markets
OPERATING SEGMENT
Revenue									1,447.8	1,447.6	1,355.7
Long-term assets, net	$ 3,963.1				$ 2,888.0				3,963.1	2,888.0
Adjusted EBITDA									195.8	228.7	212.5
Capital expenditures									148.7	180.7	83.1
UK
OPERATING SEGMENT
Revenue									500.4	513.5	509.8
Spain
OPERATING SEGMENT
Revenue									200.3	193.9	187.1
Sweden
OPERATING SEGMENT
Revenue									177.5	192.1	154.2
Italy
OPERATING SEGMENT
Revenue									200.0	178.5	185.5
Germany
OPERATING SEGMENT
Revenue									135.0	114.3	129.7
Finland
OPERATING SEGMENT
Revenue									103.0	101.7	77.3
Ireland
OPERATING SEGMENT
Revenue									37.9	34.9	17.7
Other foreign countries
OPERATING SEGMENT
Revenue									$ 93.7	$ 118.7	$ 94.4