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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Rent expense $ 8.2 $ 5.4 $ 1.3
Future non-cancelable minimum payments under operating leases      
2018 11.5    
2019 6.2    
2020 2.3    
2021 0.7    
2022 0.3    
Thereafter 0.1    
Total minimum lease payments 21.1    
Future non-cancelable minimum payments under capital leases      
2018 0.5    
2019 0.1    
Total minimum lease payments $ 0.6    
Chadds Ford, Pennsylvania      
Office leases      
Square footage | ft² 160,000    
Wilmington, Delaware      
Office leases      
Square footage | ft² 100,000    
Europe and Japan      
Office leases      
Square footage | ft² 63,000