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Revenue from Contracts with Customers - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]  
Increase in net contract assets $ 3.9
Increase in contract liabilities 1.7
Revenue recognized from contracts with customers 2.6
Interface  
Disaggregation of Revenue [Line Items]  
Increase in net contract assets $ 0.3
Minimum  
Disaggregation of Revenue [Line Items]  
Customer payment term 30 days
Maximum  
Disaggregation of Revenue [Line Items]  
Customer payment term 90 days