Commitments, Contingencies And Guarantees (Details) $ in Millions	Mar. 31, 2017 USD ($)
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability	$ (15.9)
Letters of Credit Outstanding, Amount	9.7
Loss Contingency, Range of Possible Loss, Portion Not Accrued	6.5
Expected Asset Retirement Obligation	14.5
Fair Value, Inputs, Level 3 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability	$ 15.9