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Leases - Additional Information (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Option to extend leases 6 years
Amount of operating lease contracts not yet commenced $ 46
Term of operating lease contracts not yet commenced 15 years
Minimum  
Lessee, Lease, Description [Line Items]  
Remaining term of leases 1 year
Maximum  
Lessee, Lease, Description [Line Items]  
Remaining term of leases 9 years