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Leases - Additional Information (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Operating leases not yet commenced, office facilities, amount $ 2.8
Minimum  
Lessee, Lease, Description [Line Items]  
Operating leases not yet commenced, term of contract (in years) 1 year
Maximum  
Lessee, Lease, Description [Line Items]  
Lessee, operating lease, option to extend 25 years
Operating leases not yet commenced, term of contract (in years) 7 years