LEASES (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) tenant renewal_option	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessor, Lease, Description [Line Items]
Number of tenants | tenant	1
Additional payments expected to be received	$ 46,874,700,000
Operating lease, number of renewal options | renewal_option	1
Impairment charges	$ 94,200,000	$ 394,000,000.0	$ 211,400,000
Interest expense on finance lease liabilities	1,700,000
Future minimum rental payments under capital leases		261,600,000
Amounts representing interest under capital leases		82,100,000
Lease Agreements
Lessor, Lease, Description [Line Items]
Impairment charges	$ 9,900,000
Minimum
Lessor, Lease, Description [Line Items]
Lessor, term of lease	5 years
Maximum
Lessor, Lease, Description [Line Items]
Lessor, term of lease	10 years
Estimated useful lives	20 years
Operating lease, term of contract	10 years
Maximum | Towers
Lessor, Lease, Description [Line Items]
Estimated useful lives	20 years
Maximum | Communication Sites
Lessor, Lease, Description [Line Items]
Estimated useful lives	20 years
AT&T Transaction
Lessor, Lease, Description [Line Items]
Additional payments expected to be received	$ 13,700,000,000
Land Easements
Lessor, Lease, Description [Line Items]
Future minimum rental payments under capital leases		220,300,000
Amounts representing interest under capital leases		$ 69,300,000