Commitment and Contingencies (Details) Narrative - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Long-term Purchase Commitment, Amount	$ 0.1	$ 0.3	$ 1.3
Loss contingency accrual				$ 0.4	$ 0.4