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Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Weighted average remaining lease term 11 years    
Weighted average discount rate 5.40%    
Lease operating expense $ 3.3 $ 4.4  
Cash paid for lease rent $ 2.7    
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    
Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 15 years