Leases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining lease term	6 years 1 month 6 days		6 years 1 month 6 days
Operating lease, weighted average discount rate	2.60%		2.60%
Operating lease related expenses	$ 1.5	$ 1.1	$ 3.3	$ 2.9
Operating lease payments			3.0	3.2
Noncash additions to operating lease assets			$ 1.0	$ 35.0