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Financial Instruments and Fair Value Measurements Non-Recurring Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Data Center Colocation [Member]
Dec. 31, 2011
Data Center Colocation [Member]
Jun. 30, 2012
Data Center Colocation [Member]
Dec. 31, 2010
Data Center Colocation [Member]
Dec. 31, 2012
Wireline [Member]
Dec. 31, 2011
Wireline [Member]
Dec. 31, 2010
Wireline [Member]
Dec. 31, 2012
Wireless [Member]
Dec. 31, 2011
Wireless [Member]
Dec. 31, 2010
Wireless [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Data Center Colocation [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Data Center Colocation [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Wireless [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Data Center Colocation [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Wireless [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Data Center Colocation [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Wireless [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Data Center Colocation [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Wireless [Member]
Dec. 31, 2011
Asset Group Nonrecurring Measurement [Member]
Jun. 30, 2012
Leasehold Improvements [Member]
Fair Value, Measurements, Nonrecurring [Member]
Data Center Colocation [Member]
Jun. 30, 2012
Leasehold Improvements [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Data Center Colocation [Member]
Jun. 30, 2012
Leasehold Improvements [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Data Center Colocation [Member]
Jun. 30, 2012
Leasehold Improvements [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Data Center Colocation [Member]
Dec. 31, 2012
Equipment [Member]
Fair Value, Measurements, Nonrecurring [Member]
Wireline [Member]
Dec. 31, 2012
Equipment [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Wireline [Member]
Dec. 31, 2012
Equipment [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Wireline [Member]
Dec. 31, 2012
Equipment [Member]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Wireline [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                        
Finite-lived Intangible Assets, Fair Value Disclosure                                 $ 2.8     $ 0     $ 2.8     $ 0                    
Impairment of Intangible Assets, Finite-lived   0                           1.5                                        
Fair Value Inputs, Discount Rate 12.00%                                                                      
Property, plant and equipment, net           14.2                 0                                          
Property, Plant, and Equipment, Fair Value Disclosure                                     0     0     0     0 2.4 0 2.4 0 0.4 0 0.4 0
Property, plant and equipment, net 1,587.4 1,400.5                                                   2.1                
Impairment of assets, excluding goodwill (14.2) (2.1) 0 11.8       0.5 1.0   0.4 1.1     (2.1)                                          
Goodwill 290.6 290.6 341.7 276.3 276.3   276.3 11.8 11.8 12.6 0 0 50.3         0                                    
Assets, Fair Value Disclosure                                         0     0     0                  
Impairment of goodwill 0 (50.3) 0 0 0     0 0   0 (50.3)           (50.3)                                    
Impairment of goodwill and other assets $ 14.2 $ 52.4 $ 0 $ (13.3)                   $ 14.2 $ 52.4                                          
Allocation of Income Approach   75.00%                                                                    
Allocation of Market Approach   25.00%                                                                    
Weighted Average Cost of Capital   11.50%