Commitment and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Commitments and Contingencies [Abstract]
Loss Contingency, Estimate of Possible Loss	$ 0.9	$ 0.2
Long-term Purchase Commitment, Amount	2.5
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 1.2