Commitments and Contingencies Litigation (Details) - Refinery outage [Member] - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2014	Sep. 30, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Damages sought	$ 48.5	$ 65.6	$ 61.7
Retention amount	$ 2.0