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Acquisitions (Narrative) (Details)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 31, 2018
USD ($)
item
Dec. 31, 2017
item
Nov. 30, 2014
item
Sep. 30, 2018
USD ($)
item
Business Acquisition [Line Items]        
Number of towers acquired | item   941 1,641  
Other Acquisitions [Member]        
Business Acquisition [Line Items]        
Number of towers acquired | item       1,237
Property and equipment       $ 124.3
Intangible assets       262.6
Working capital adjustments       $ 14.9
Subsequent Event [Member]        
Business Acquisition [Line Items]        
Number of towers acquired | item 46      
Cash paid for acquisition $ 17.1