BUSINESS SEGMENTS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($) segment	Sep. 30, 2019 segment	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments divided | segment			2
Number of reportable segments | segment	6	6	5
Segment revenues	$ 1,993.1			$ 1,813.4
Selling, general, administrative and development expense	217.8			198.1
OPERATING INCOME	736.8			614.9
Stock-based compensation expense	47.7			42.5
Depreciation, amortization and accretion	472.3			436.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	439.7			441.6
Total assets	40,789.1	$ 42,801.6		38,926.8
Operating Expense
Segment Reporting Information [Line Items]
Stock-based compensation expense	0.9			0.9
Stock-based compensation expense Services
Segment Reporting Information [Line Items]
Stock-based compensation expense	46.8	$ 41.6		41.6
Operating Segments
Segment Reporting Information [Line Items]
Segment revenues	1,993.1			1,813.4
Segment operating expenses	551.1			542.5
Segment gross margin	1,442.0			1,270.9
Selling, general, administrative and development expense	127.3			117.8
OPERATING INCOME	1,314.7			1,153.1
Operating Segments | Property
Segment Reporting Information [Line Items]
Segment revenues	1,973.2			1,786.0
Segment operating expenses	543.5			532.4
Segment gross margin	1,429.7			1,253.6
Selling, general, administrative and development expense	123.8			114.4
OPERATING INCOME	1,305.9			1,139.2
Total assets	40,276.7			38,532.4
Operating Segments | Property, US
Segment Reporting Information [Line Items]
Segment revenues	1,089.9			986.3
Segment operating expenses	190.0			191.3
Segment gross margin	899.9			795.0
Selling, general, administrative and development expense	42.0			41.7
OPERATING INCOME	857.9			753.3
Total assets	22,486.9			22,160.9
Operating Segments | Property, Asia
Segment Reporting Information [Line Items]
Segment revenues	286.6			288.9
Segment operating expenses	164.0			178.0
Segment gross margin	122.6			110.9
Selling, general, administrative and development expense	32.6			26.6
OPERATING INCOME	90.0			84.3
Total assets	4,986.0			5,427.6
Operating Segments | Property, Africa
Segment Reporting Information [Line Items]
Segment revenues	225.5			144.0
Segment operating expenses	77.7			53.5
Segment gross margin	147.8			90.5
Selling, general, administrative and development expense	17.1			13.2
OPERATING INCOME	130.7			77.3
Total assets	4,510.3			2,085.5
Operating Segments | Property, Europe
Segment Reporting Information [Line Items]
Segment revenues	34.5			33.5
Segment operating expenses	6.6			6.2
Segment gross margin	27.9			27.3
Selling, general, administrative and development expense	5.5			5.2
OPERATING INCOME	22.4			22.1
Total assets	1,554.5			1,552.0
Operating Segments | Property, Latin America
Segment Reporting Information [Line Items]
Segment revenues	336.7			333.3
Segment operating expenses	105.2			103.4
Segment gross margin	231.5			229.9
Selling, general, administrative and development expense	26.6			27.7
OPERATING INCOME	204.9			202.2
Total assets	6,739.0			7,306.4
Operating Segments | Services
Segment Reporting Information [Line Items]
Segment revenues	19.9			27.4
Segment operating expenses	7.6			10.1
Segment gross margin	12.3			17.3
Selling, general, administrative and development expense	3.5			3.4
OPERATING INCOME	8.8			13.9
Total assets	29.0			43.8
Other
Segment Reporting Information [Line Items]
Selling, general, administrative and development expense	43.7			38.7
Stock-based compensation expense	47.7			42.5
Depreciation, amortization and accretion	472.3			436.9
Other expense	311.3			193.4
Total assets	$ 483.4			$ 350.6