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Revenues from Contracts - Remaining Performance Obligations (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Performance obligation after the effect of practical expedients $ 97.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation satisfaction period (years) 12 months
Expected revenue recognition on remaining performance obligations over the next 12 months (as a percentage) 50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation satisfaction period (years)
Expected revenue recognition on remaining performance obligations over the next 12 months (as a percentage) 70.00%