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Revenue - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue from Contract with Customer [Abstract]        
Contract revenue recognized $ 10.3 $ 7.0 $ 78.0 $ 50.5
Remaining performance obligation $ 501.5   $ 501.5  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01        
Disaggregation of Revenue        
Revenue, remaining performance obligation 87.80%   87.80%  
Performance obligations expected to be satisfied, expected timing     1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01        
Disaggregation of Revenue        
Revenue, remaining performance obligation 1.60%   1.60%  
Performance obligations expected to be satisfied, expected timing     1 year