ACCRUED EXPENSES (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Accrued property and real estate taxes	$ 198.1	$ 169.7
Accrued pass-through costs	74.2	71.2
Amounts payable to tenants	77.9	93.5
Accrued rent	75.6	61.4
Payroll and related withholdings	102.4	90.4
Accrued construction costs	27.8	41.5
Accrued income tax payable	55.2	57.9
Other accrued expenses	347.0	362.7
Accrued expenses	$ 958.2	$ 948.3