Leases - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, initial lease term	15 years	15 years
Lessee, operating lease, liability, payments, net of sublease income, due	$ 5.9	$ 5.9
Sublease income	$ 0.2	$ 0.4
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term		16 years