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Share-Based Compensation - Exercise Price - (Details) shares in Thousands, Option in Thousands | Dec. 31, 2017 CAD Option Y shares | Dec. 31, 2016 CAD Option shares | Dec. 31, 2015 CAD Option
--- | --- | --- | ---
Share based compensation |  |  |
Number of share options | Option | 31,110 | 31,442 | 29,090
Weighted average remaining contractual life | Y | 4 |  |
Weighted Average exercise price | CAD 36.96 | CAD 35.98 | CAD 36.97
Number of exercisable share option | Option | 17,363 | 17,821 |
Weighted Average exercise price Exercisable | CAD 36.53 | CAD 37.74 |
Shares available for future issuance | shares | 28,972 | 10,937 |
24.50 to 34.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 11,466 |  |
Weighted average remaining contractual life | Y | 4 |  |
Weighted Average exercise price | CAD 31.32 |  |
Number of exercisable share option | Option | 6,714 |  |
Weighted Average exercise price Exercisable | CAD 32.07 |  |
35.00 to 39.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 9,987 |  |
Weighted average remaining contractual life | Y | 4 |  |
Weighted Average exercise price | CAD 37.72 |  |
Number of exercisable share option | Option | 8,006 |  |
Weighted Average exercise price Exercisable | CAD 37.44 |  |
40.00 to 44.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 8,347 |  |
Weighted average remaining contractual life | Y | 5 |  |
Weighted Average exercise price | CAD 41.99 |  |
Number of exercisable share option | Option | 1,333 |  |
Weighted Average exercise price Exercisable | CAD 41.70 |  |
45.00 to 49.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 1,197 |  |
Weighted Average exercise price | CAD 47.52 |  |
Number of exercisable share option | Option | 1,197 |  |
Weighted Average exercise price Exercisable | CAD 47.52 |  |
50.00 to 69.97 |  |  |
Share based compensation |  |  |
Number of share options | Option | 113 |  |
Weighted Average exercise price | CAD 59.54 |  |
Number of exercisable share option | Option | 113 |  |
Weighted Average exercise price Exercisable | CAD 59.54 |  |
Minimum | 24.50 to 34.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 24.50 |  |
Minimum | 35.00 to 39.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 35.00 |  |
Minimum | 40.00 to 44.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 40.00 |  |
Minimum | 45.00 to 49.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 45.00 |  |
Minimum | 50.00 to 69.97 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 50.00 |  |
Maximum | 24.50 to 34.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 34.99 |  |
Maximum | 35.00 to 39.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 39.99 |  |
Maximum | 40.00 to 44.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 44.99 |  |
Maximum | 45.00 to 49.99 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | 49.99 |  |
Maximum | 50.00 to 69.97 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | CAD 69.97 |  |

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