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Leases (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lessee, Lease, Description [Line Items]        
Option to extend, term 10 years   10 years  
Option to terminate, term     1 year  
Weighted average remaining lease term 4 years   4 years  
Weighted average discount rate 5.31%   5.31%  
Rent expense under topic 842 $ 3.6   $ 7.0  
Rent expense under topic 840   $ 3.3   $ 6.6
Minimum        
Lessee, Lease, Description [Line Items]        
Remaining lease term     1 year  
Maximum        
Lessee, Lease, Description [Line Items]        
Remaining lease term     8 years