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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Basis of Presentation          
TDS ownership of U.S. Cellular 84.00%   84.00%    
Agent liability $ 48.4   $ 48.4   $ 75.3
Amounts recorded gross in revenues that are billed to customers and remitted to governmental authorities $ 32.3 $ 30.3 $ 102.2 $ 92.7