Commitments And Contingencies Commitments And Contingencies (Narrative) (Details) - 9 months ended Sep. 30, 2015 CAD in Millions, $ in Millions	CAD	USD ($)
Loss Contingencies [Line Items]
Third party letter of credit draw	CAD 33	$ 26.2
Gathering and Processing Potential Claim | CAD	CAD 126
Third party pipeline expense		21.5
Rejected Contracts in Chapter 11 [Member]
Loss Contingencies [Line Items]
GPT Contracts Minimum Future Payments Total		39.0
Re-negotiated NGL Contract [Member]
Loss Contingencies [Line Items]
GPT Contracts Minimum Future Payments Total		$ 100.0