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Basis of Preparation - Narratives (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
facility
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
facility
Jun. 30, 2018
USD ($)
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle          
Right of use assets $ 29.0   $ 29.0    
Operating lease liability 29.0   29.0    
Operating lease liability, current $ 6.4   $ 6.4    
Weighted average lease term 6 years 10 months 24 days   6 years 10 months 24 days    
Operating lease weighted average discount rate (percent) 4.70%   4.70%    
Operating lease rental expense $ 2.1 $ 2.2 $ 4.1 $ 4.2  
Number of leased facilities (facility) | facility 11   11    
ASU 2016-02          
New Accounting Pronouncements or Change in Accounting Principle          
Right of use assets         $ 34.8
Operating lease liability         $ 34.8