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Income Taxes, Additional Disclosures (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Disclosure [Abstract]      
Range of potential change in unrecognized tax benefits due to closure of state income tax audits and expiration of statutes of limitations within the next year $ 9.7    
Net accrued interest and penalties, total 15.6 19.3  
Accrued interest and penalties related to unrecognized income tax benefits $ (2.6) $ 3.0 $ 2.1
Federal
      
Income Tax Disclosure [Abstract]      
Open tax years by major tax jurisdiction The TDS consolidated group remains subject to federal income tax audits for the tax years after 2007.    
State
      
Income Tax Disclosure [Abstract]      
Open tax years by major tax jurisdiction With only a few exceptions, TDS is no longer subject to state income tax audits for years prior to 2007.