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Stock-Based Compensation (Allocation of Stock-Based Compensation Costs by Plan) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 3.8 $ 4.6 $ 7.8 $ 8.9
Cost of Revenue [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 2.0 2.1 4.0 4.1
Selling and Marketing Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 0.5 0.6 1.0 1.1
General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 1.3 $ 1.9 $ 2.8 $ 3.7