Reportable Segments by Segment (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues-Services(a)	$ 383.8	$ 358.9	$ 347.8
Operating expenses	160.7	169.2	160.1
Other (income) expense, net	(9.3)	3.4	0.2
D&A	82.6	71.7	64.2
Other expense (income) net of foreign exchange loss, net	0.2	4.4	(1.5)
Terminals
Segment Reporting Information [Line Items]
Revenues-Services(a)	321.6	298.6	287.5
Operating expenses	137.6	136.9	129.6
Other (income) expense, net	(9.3)	3.1	0.2
D&A	78.5	65.7	60.2
Other expense (income) net of foreign exchange loss, net	0.1	(4.2)	(1.5)
Pipelines
Segment Reporting Information [Line Items]
Revenues-Services(a)	62.2	60.3	60.3
Operating expenses	23.1	32.3	30.5
Other (income) expense, net	0.0	0.3	0.0
D&A	4.1	6.0	4.0
Other expense (income) net of foreign exchange loss, net	$ 0.1	$ 8.6	$ 0.0