Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Lease right-of-use assets	$ 13.9
Operating lease liability	$ 14.9
Lease remaining term of contract	11 years
Operating cash flows from operating leases	$ 3.1
Right-of-use assets obtained in exchange for operating lease obligations	$ 0.4
Weighted average remaining lease term	8 years 1 month 6 days
Weighted average discount rate	4.90%
Rent expense under operating leases		$ 7.2	$ 6.8
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				$ 16.0
Operating lease liability				$ 17.0