Operating Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Lessor, Lease, Description [Line Items]
Weighted-average lease term	2 years
Weighted-average discount rate	3.35%
Accounting Standards Update 2016-02
Lessor, Lease, Description [Line Items]
Right-of-use asset		$ 0.2
Lease liability		$ 0.2
Operating lease cost	$ 0.1