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Revenue - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Revenue $ 171.8 $ 186.6
Infrastructure    
Segment Reporting Information [Line Items]    
Revenue 161.3 176.5
Spectrum    
Segment Reporting Information [Line Items]    
Revenue 10.5 10.1
Operating Segments | Infrastructure    
Segment Reporting Information [Line Items]    
Revenue 161.3 176.5
Operating Segments | Spectrum    
Segment Reporting Information [Line Items]    
Revenue $ 10.5 $ 10.1