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Description of Business and Accounting Policies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Wireless [Member]
Dec. 31, 2013
Wireless [Member]
Property, Plant and Equipment [Member]
Mar. 31, 2013
Wireless [Member]
Software [Member]
Property, Plant and Equipment [Line Items]          
Investment owned in CyrusOne Inc., Balance, Shares 1.9        
Investment owned in CyrusOne LP, Balance, Partnership Units 42.6        
Total ownership interests in Equity Method Investee, Percentage 68.00%        
Dividends received from CyrusOne $ 7.1 $ 0      
Property, Plant and Equipment, Useful Life       30 months 3 years
Change in Accounting Estimate, Effect of Change on Operating Results, Increase in Depreciation Expense 9.0 8.5      
Change in Accounting Estimate, Effect of Change on Basic and Diluted Earnings Per Share $ (0.03) $ (0.03)      
Sale Leaseback Transaction, Deferred Gain, Remaining Amortization Period     30 months    
Sale Leaseback Transaction, Current Period Gain Recognized 3.6 0.6      
Valuation Allowance, Deferred Tax Asset, Change in Amount   $ 10.7