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Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Lessee, Lease, Description [Line Items]          
Weighted average remaining lease term 10 years 9 months 18 days   10 years 9 months 18 days    
Weighted average discount rate 5.40%   5.40%    
Lease operating expense $ 3.0 $ 4.4 $ 6.3 $ 8.8  
Cash paid for lease rent $ 5.1   $ 2.4    
Operating lease commitments, 2019         $ 10.4
Operating lease commitments, 2020         9.9
Operating lease commitments, 2021         11.7
Operating lease commitments, 2022         10.9
Operating lease commitments, 2023         10.3
Operating lease commitments, thereafter         $ 73.9
Minimum          
Lessee, Lease, Description [Line Items]          
Remaining lease term 1 year   1 year    
Maximum          
Lessee, Lease, Description [Line Items]          
Remaining lease term 15 years   15 years