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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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,	2016			2015
Weighted average fair value per option	$	2.80		$	2.66
Expected term		5 years			5 years
Risk-free interest rate		0.66	%		0.73	%
Expected dividend yield		4.08	%		3.65	%
Expected volatility		15.45	%		14.58	%

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, 2015	2,927,068	$	33.07		1,453,486	$	2.64
Granted	615,100		46.19		615,100		2.80
Exercised	(622,168)		25.65		N/A		N/A
Forfeited	-		-		(548,461)		2.68
Options outstanding December 31, 2016	2,920,000	$	37.42		1,520,125	$	2.69
Options exercisable December 31, 2016 (2)(3)	1,399,875	$	33.35
(1) As at December 31, 2016 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 2.4 years (2015 - $3 million, 2.3 years).
(2) As at December 31, 2016, the weighted average remaining term of vested options was 5.7 years with an aggregate intrinsic value of $17 million (2015 - 5.3 years, $21 million).
(3) As at December 31, 2016 the fair value of options that vested in the year was $2 million (2015 - $1 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, 2015	606,646	$	26.27	362,750	$	31.36
Granted including DRIP	74,855		37.60	69,429		43.67
Exercised	(570)		46.58	(36,381)		27.42
Outstanding and exercisable as at December 31, 2016	680,931	$	27.50	395,798	$	33.88

	Employee PSU		Weighted Average Grant Date Fair Value		Aggregate intrinsic value
Outstanding as at December 31, 2015	497,496	$	34.50	$	21.5
Granted including DRIP	280,950		40.60
Exercised	(208,999)		34.39
Forfeited	(8,567)		37.54
Outstanding as at December 31, 2016	560,880	$	37.55	$	25.5

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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=6415400&loc=d3e5070-113901

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