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Basis of Preparation - Narratives (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
facility
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
facility
Sep. 30, 2018
USD ($)
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle          
Right of use assets $ 34.9   $ 34.9    
Operating lease liability 35.5   35.5    
Operating lease liabilities, current $ 6.8   $ 6.8    
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 $ 2.7 $ 2.0 $ 6.8 $ 6.2  
Number of leased facilities (facility) | facility 10   10    
ASU 2016-02          
New Accounting Pronouncements or Change in Accounting Principle          
Right of use assets         $ 34.8
Operating lease liability         $ 34.8