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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

For the year ended December 31,	2017			2016
Weighted average fair value per option	$	2.37		$	2.80
Expected term		5 years			5 years
Risk-free interest rate		1.22	%		0.66	%
Expected dividend yield		4.60	%		4.08	%
Expected volatility		14.41	%		15.45	%

Schedule of Stock Options Roll Forward [Table Text Block]

	Total Options				Non-Vested Options(1)
	Number of Options	Weighted average exercise price per share			Number of Options	Weighted average grant date fair-value
Outstanding as at December 31, 2016	2,920,000	$	37.42		1,520,125	$	2.69
Granted	827,400		45.16		827,400		2.37
Exercised	(103,825)		28.91		N/A		N/A
Forfeited	-		-		(607,875)		2.73
Options outstanding December 31, 2017	3,643,575	$	39.42		1,739,650	$	2.52
Options exercisable December 31, 2017 (2)(3)	1,903,925	$	35.37
(1) As at December 31, 2017 there was $3 million of unrecognized compensation related to stock options not yet vested which is expected to be recognized over a weighted average period of approximately 2.5 years (2016 - $3 million, 2.4 years).
(2) As at December 31, 2017, the weighted average remaining term of vested options was 5.4 years with an aggregate intrinsic value of $22 million (2016 - 5.7 years, $17 million).
(3) As at December 31, 2017 the fair value of options that vested in the year was $2 million (2016 - $2 million).

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

	Employee DSU		Weighted Average Grant Date Fair Value	Director DSU		Weighted Average Grant Date Fair Value
Outstanding as at December 31, 2016	680,931	$	27.50	395,798	$	33.88
Granted including DRIP	73,185		37.74	86,281		42.96
Exercised	(2,482)		46.58	(9,486)		44.00
Forfeited	(34)		46.58	(108)		45.39
Outstanding and exercisable as at December 31, 2017	751,600	$	28.44	472,485	$	35.33

	Employee PSU		Weighted Average Grant Date Fair Value		Aggregate intrinsic value
Outstanding as at December 31, 2016	560,880	$	37.55	$	25.5
Granted including DRIP	519,789		44.35
Exercised	(220,075)		30.67
Forfeited	(30,596)		43.66
Outstanding as at December 31, 2017	829,998	$	43.41	$	41.1

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Tabular disclosure of the change in stock options.

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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