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Restructuring - Narrative (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Employee Severance and Benefits  
Restructuring Cost and Reserve [Line Items]  
Remaining liability for costs incurred $ 0
The Plan | Employee Severance and Benefits  
Restructuring Cost and Reserve [Line Items]  
Costs incurred 5,000,000
Payments for restructuring 0
Remaining liability for costs incurred 5,000,000
The Plan | Minimum  
Restructuring Cost and Reserve [Line Items]  
Costs expected to incur 8,000,000
The Plan | Minimum | Employee Severance and Benefits  
Restructuring Cost and Reserve [Line Items]  
Costs expected to incur 6,000,000
The Plan | Maximum  
Restructuring Cost and Reserve [Line Items]  
Costs expected to incur 10,000,000
The Plan | Maximum | Employee Severance and Benefits  
Restructuring Cost and Reserve [Line Items]  
Costs expected to incur $ 7,000,000