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Summary of Significant Accounting Policies - Remaining Performance Obligation (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Accounting Policies [Abstract]  
Revenue remaining performance obligation $ 431.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing 5 years