ACCRUED EXPENSES (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Accrued property and real estate taxes	$ 169.7	$ 154.4
Amounts payable to tenants	93.5	60.8
Payroll and related withholdings	90.4	82.2
Accrued pass-through taxes	71.2	59.7
Accrued rent	61.4	54.0
Accrued income tax payable	57.9	15.3
Accrued construction costs	41.5	31.9
Accrued pass-through taxes	2.2	25.3
Other accrued expenses	360.5	370.7
Accrued expenses	$ 948.3	$ 854.3