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Summary of Significant Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Summary of Significant Accounting Policies [Line Items]        
Cost-method investments, impairment loss $ 0 $ 0 $ 0  
Proceeds from sale of other investments 625,800,000 150,900,000    
Gain on sale of investments 0 0    
Cost-method investments, carrying value 13,800,000 14,600,000    
Interest cost capitalized $ 700,000 900,000 1,100,000  
Intangible assets, useful life 15 years      
Impairment charge recognized, related to long-lived assets $ 33,100,000 27,100,000 36,700,000  
Accounts receivable, net 132,125,000 111,035,000    
Asset retirement obligation 11,500,000 9,900,000    
Right-of-use assets, net 2,572,217,000 [1]     $ 2,600,000,000
Current lease liabilities 247,015,000 [1]     226,000,000.0
Long-term lease liabilities 2,279,400,000 [1]     $ 2,300,000,000
Right-of-use assets previously recorded in prepaid expenses and other current assets 266,300,000      
Cumulative effect of adoption $ 20,968,000      
Renewal term 5 years      
Unamortized deferred lease costs $ 1,800,000 11,300,000 11,000,000.0  
Amortization expense 1,400,000 12,200,000 13,100,000  
Deferred lease costs 4,900,000 27,000,000.0    
Gain (loss) on remeasurement of U.S. dollar denominated intercompany loan 9,000,000.0 (58,800,000) $ (5,800,000)  
Intercompany foreign currency outstanding balance $ 899,700,000 536,900,000    
Oi S.A. [Member]        
Summary of Significant Accounting Policies [Line Items]        
Percentage reduction in accounts receivable due to customer reorganization plan 10.00%      
Number of annual installment payments | item 4      
Minimum [Member]        
Summary of Significant Accounting Policies [Line Items]        
Fixed rent escalation 2.00%      
Lease term 5 years      
Maximum [Member]        
Summary of Significant Accounting Policies [Line Items]        
Fixed rent escalation 3.00%      
Lease term 10 years      
Site Development Revenue [Member]        
Summary of Significant Accounting Policies [Line Items]        
Accounts receivable, net $ 40,700,000 $ 27,100,000    
Site Development Revenue [Member] | Revenue [Member]        
Summary of Significant Accounting Policies [Line Items]        
Concentration risk percentage 8.00%      
[1] On January 1, 2019, the Company adopted ASU 2016-02 which requires lessees to recognize a right-of-use asset and a lease liability. Upon adoption, certain assets and liabilities were reclassified to Right-of-use assets, net and lease liabilities in accordance with provisions of ASU 2016-02. See Note 2 for further discussion.