Leases - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease not yet commenced, undiscounted amount	$ 52.8
Minimum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term	30 years