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Debt - Term Loan Facilities (Details) - USD ($)
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]        
Repayment of long-term debt     $ 0 $ 2,000,000
TDS Term loan facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity     200,000,000  
Amount borrowed     200,000,000  
Amount available for use     $ 0  
TDS Term loan facility | Subsequent event        
Debt Instrument [Line Items]        
Repayment of long-term debt   $ 500,000    
TDS Term loan facility | LIBOR rate        
Debt Instrument [Line Items]        
Contractual spread     2.00%  
UScellular | UScellular Term loan facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 300,000,000  
Amount borrowed     300,000,000  
Amount available for use     $ 0  
UScellular | UScellular Term loan facility | Subsequent event        
Debt Instrument [Line Items]        
Repayment of long-term debt $ 750,000      
UScellular | UScellular Term loan facility | LIBOR rate        
Debt Instrument [Line Items]        
Contractual spread     2.25%