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Contingencies (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
Contingencies (Narrative) (Details) $ in Millions	Mar. 31, 2016 plaintiffs	Dec. 31, 2013 plaintiffs	Mar. 31, 2015 USD ($)
Oil and Gas Delivery Commitments and Contracts [Line Items]
Loss Contingency, Number of Plaintiffs	47
Loss Contingency, Claims Settled, Number		58
Loss Contingency, Claims Settled Pending Documentation, Number	13
Letters of Credit Outstanding, Amount \| $			$ 62.5