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Acquisitions (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended
May 06, 2021
USD ($)
item
Mar. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]      
Performance targets, maximum potential obligation   $ 18.3 $ 35.0
Other Acquisitions [Member]      
Business Acquisition [Line Items]      
Number of towers acquired | item   34  
Property and equipment   $ 2.2  
Intangible assets   21.1  
Other net assets and liabilities assumed   $ 78.4  
Subsequent Event [Member]      
Business Acquisition [Line Items]      
Number of towers acquired | item 17    
Cash paid for acquisition $ 6.0