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Goodwill and Intangible Assets - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets        
Amortization expense $ 5.0 $ 2.6 $ 15.7 $ 7.0
Government grants | Minimum        
Finite-Lived Intangible Assets        
Finite lived intangible assets useful life     10 years  
Government grants | Maximum        
Finite-Lived Intangible Assets        
Finite lived intangible assets useful life     50 years