Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Components of our income tax provision are as follows:

Year Ended December 31,	2018	2017	2016
(In millions of Canadian dollars)
Current tax expense (benefit)	43.1	6.8	0.4
Deferred tax expense	(5.3)	14.0	23.0
Total tax provision	37.8	20.8	23.4

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The difference between the statutory income tax rate and our effective income tax rate is summarized as follows:

Year Ended December 31,	2018			2017			2016
(In millions of Canadian dollars, except percentages)
Statutory income tax	37.2	27.0	%	19.2	27.0	%	25.3	27.0	%
Increase (decrease) as a result of:
Capital gains deduction	—	—	%	—	—	%	(2.0)	(2.1)	%
Valuation allowance	(0.2)	(0.1)	%	—	—	%	(2.0)	(2.1)	%
Tax impact on the future tax rate change	—	—	%	0.8	1.1	%	1.9	2.0	%
Inter-corporate charges not tax deducted	2.4	1.7	%	2.2	3.1	%	(0.3)	(0.3)	%
Other	(1.6)	(1.2)	%	(1.4)	(2.0)	%	0.5	0.5	%
Total	37.8	27.4	%	20.8	29.2	%	23.4	25.0	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Deferred tax assets and liabilities result from the following: 

December 31,	2018	2017
(In millions of Canadian dollars)
Deferred tax assets
Non capital losses	0.1	—
Reserves	35.8	43.0
Capital losses	0.2	27.2
Investment in partnerships	144.4	117.4
Valuation allowances	(144.6)	(144.5)
Total deferred tax assets	35.9	43.1
Deferred tax liabilities
Property, plant and equipment	(36.0)	(392.0)
Total deferred tax liabilities	(36.0)	(392.0)
Net non-current deferred tax liability	(0.1)	(348.9)