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Leases - Narratives (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
facility
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
facility
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Leases [Abstract]          
Right of use assets $ 30.5   $ 30.5    
Operating lease liability $ 30.5   $ 30.5    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet   us-gaap:PropertyPlantAndEquipmentNet    
Operating lease liabilities, current $ 5.1   $ 5.1   $ 6.3
Weighted average lease term 6 years 3 months 18 days   6 years 3 months 18 days    
Operating lease weighted average discount rate (percent) 4.70%   4.70%    
Operating lease rent expense $ 3.2 $ 2.1 $ 6.2 $ 4.1  
Number of operating contracts | facility 7   7