Leases - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Lease right-of-use assets	$ 15.2
Operating lease liability	$ 16.0
Lease remaining term of contract	11 years
Operating cash flows from operating leases	$ 1.6
Right-of-use assets obtained in exchange for operating lease obligations	$ 0.8
Weighted average remaining lease term	8 years 3 months 18 days
Weighted average discount rate	4.80%
Maximum
Lessee, Lease, Description [Line Items]
Lease extension term	5 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Lease right-of-use assets		$ 16.2
Operating lease liability		$ 17.0