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Restructuring Expenses (Details)
$ in Millions
 6 Months Ended
Feb. 15, 2017
Employee
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]      
Facility-related costs incurred   $ 3.0  
Restructuring expenses paid   1.9  
Remaining balance   $ 1.1  
Number of positions eliminated | Employee 100    
Employee severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses paid     $ 3.1
Restructuring expected cost     3.8
Facility-related cost      
Restructuring Cost and Reserve [Line Items]      
Facility-related costs incurred     0.6
Restructuring expenses paid     0.1
Restructuring reserve, unpaid balance in accrued compensation     0.5
Accrued severance and related expenses | Employee severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve, unpaid balance in accrued compensation     $ 0.7