Risk Management and Financial Instruments (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign Currency Transactions and Translation [Line Items]
Released foreign currency translation gains held in AOCI, net of tax	$ 10.1
Foreign Currency Transaction Gain (Loss), Unrealized	(0.8)	$ 5.6	$ (32.6)
Kinder Morgan, Inc. [Member] | Continuing Operations [Member]
Foreign Currency Transactions and Translation [Line Items]
Foreign Currency Transaction Gain (Loss), Unrealized		0.2	13.2
Kinder Morgan, Inc. [Member] | Discontinued Operations [Member]
Foreign Currency Transactions and Translation [Line Items]
Foreign Currency Transaction Gain (Loss), Unrealized		(2.6)	16.5
Puget Sound and Cochin [Member] | Continuing Operations [Member]
Foreign Currency Transactions and Translation [Line Items]
Foreign Currency Transaction Gain (Loss), Realized	(0.9)	0.3
Foreign Currency Transaction Gain (Loss), Unrealized	$ 1.0	$ (5.6)	$ 1.4