Litigation, Commitments and Contingencies (General) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 0.0	$ 0.0
Baseline Terminal Project Litigation [Member] | Initial claim [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	21.2
Baseline Terminal Project Litigation [Member] | 2nd claim [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	1.0
Baseline Terminal Project Litigation [Member] | Barrier Coating Inc [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	2.5
Baseline Terminal Project Litigation [Member] | Fabricom Inc. [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 30.4