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Leases - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
lease
Lessee, Lease, Description [Line Items]      
Number of leases not yet commenced | lease     3
Lease not yet commenced liability amount     $ 4.6
Total lease cost $ 5.5 $ 16.8  
Minimum      
Lessee, Lease, Description [Line Items]      
Contractual option to renew certain leases     2 months
Lease not yet commenced term     2 years
Maximum      
Lessee, Lease, Description [Line Items]      
Contractual option to renew certain leases     5 years
Remaining lease terms     13 years
Lease not yet commenced term     8 years