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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Basis of Presentation        
TDS ownership of U.S. Cellular 84.00%   84.00%  
Amounts recorded gross in revenues that are billed to customers and remitted to governmental authorities $ 25.4 $ 28.1 $ 51.8 $ 60.2
Equipment installment plans
       
Basis of Presentation        
Maximum installment period under equipment installment plans     24  
Equipment installment plans | Customer deposits and deferred revenue
       
Basis of Presentation        
Current guarantee liability and imputed interest 15.3   15.3  
Equipment installment plans | Other deferred liabilities and credits
       
Basis of Presentation        
Long-term imputed interest 0.7   0.7  
Equipment installment plans | Accounts receivable customer and agent
       
Basis of Presentation        
Current equipment installment plan receivables 23.9   23.9  
Equipment installment plans | Other assets and deferred charges
       
Basis of Presentation        
Long-term equipment installment plan receivables $ 19.8   $ 19.8