Commitments, Contingencies And Guarantees (Details) $ in Millions	Dec. 31, 2016 USD ($)
Business Acquisition, Contingent Consideration [Line Items]
Letters of Credit Outstanding, Amount	$ 10.2
Expected Asset Retirement Obligation	14.1
Fair Value, Inputs, Level 3 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability	$ 14.0