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Significant Accounting Policies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Customer Concentration Risk [Member]
Customer
Dec. 31, 2011
Customer Concentration Risk [Member]
Customer
Dec. 31, 2013
Performance Shares (PSAs) [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Computer, Equipment and Software [Member]
Minimum [Member]
Dec. 31, 2013
Computer, Equipment and Software [Member]
Maximum [Member]
Dec. 31, 2013
Furniture and fixtures [Member]
Dec. 31, 2013
Building and building Improvements [Member]
Minimum [Member]
Dec. 31, 2013
Building and building Improvements [Member]
Maximum [Member]
Dec. 31, 2013
Land Improvements [Member]
Minimum [Member]
Dec. 31, 2013
Land Improvements [Member]
Maximum [Member]
Dec. 31, 2013
Leasehold improvements [Member]
Maximum [Member]
Dec. 31, 2013
Depreciable Assets [Member]
Sep. 30, 2013
Depreciable Assets [Member]
Jun. 30, 2013
Depreciable Assets [Member]
Dec. 31, 2013
Depreciable Assets [Member]
Dec. 31, 2012
Sales Revenue, Segment [Member]
Verizon [Member]
Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]                                          
Maturity of Highly Liquid Investments 3 months                                        
Maturity period of non designated hedges derivatives 1 year                                        
Maturities of Cash Flow Hedge Derivatives 1 year                                        
Property and Equipment, Useful Life                 3 years 5 years 5 years 7 years 40 years 10 years 40 years 10 years          
Change in accounting estimate- depreciation expense impact                                 $ (7.9) $ (9.4) $ (11.0) $ 28.3  
Change in accounting estimate, diluted net income per share impact                                 $ 0.01 $ 0.01 $ 0.01 $ 0.04  
Contractual Period             1 year 3 years                          
Contractual Support Period 1 year                                        
Warranty Period Hardware (in years) 1 year                                        
Warranty Period Software (in days) 90 days                                        
Advertising Expense $ 20.1 $ 20.0 $ 17.2                                    
Award vesting period           3 years                              
More than likely percentage of being realized upon settlement, tax benefit 50.00%                                        
Liability for unrecognized tax benefits as current 1 year                                        
Number of Customers Accounting for Ten Percent or More of Net Revenues       0 0                                
Concentration Risk, Percentage                                         10.30%