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Stock Based Compensation (Tables) | 12 Months Ended
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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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- Definition 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 + Details
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