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Share-Based Compensation - Exercise Price - (Details) shares in Thousands, Option in Thousands | Dec. 31, 2018 CAD ($) Option Y shares | Dec. 31, 2017 CAD ($) Option shares | Dec. 31, 2016 CAD ($) Option
--- | --- | --- | ---
Share based compensation |  |  |
Number of share options | Option | 28,935 | 31,110 | 31,442
Weighted average remaining contractual life | Y | 4 |  |
Weighted Average Exercise Price | $ 38.25 | $ 36.96 | $ 35.98
Number of exercisable share option | Option | 15,374 | 17,363 |
Weighted Average Exercise Price Exercisable | $ 36.10 | $ 36.53 |
Shares available for future issuance | shares | 21,929 | 28,972 |
24.50 to 34.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 7,821 |  |
Weighted average remaining contractual life | Y | 3 |  |
Weighted Average Exercise Price | $ 30.90 |  |
Number of exercisable share option | Option | 5,589 |  |
Weighted Average Exercise Price Exercisable | $ 31.16 |  |
35.00 to 39.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 7,214 |  |
Weighted average remaining contractual life | Y | 3 |  |
Weighted Average Exercise Price | $ 37.74 |  |
Number of exercisable share option | Option | 7,195 |  |
Weighted Average Exercise Price Exercisable | $ 37.74 |  |
40.00 to 44.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 13,714 |  |
Weighted average remaining contractual life | Y | 6 |  |
Weighted Average Exercise Price | $ 42.53 |  |
Number of exercisable share option | Option | 2,590 |  |
Weighted Average Exercise Price Exercisable | $ 42.19 |  |
45.00 to 49.99 |  |  |
Share based compensation |  |  |
Number of share options | Option | 58 |  |
Weighted average remaining contractual life | Y | 7 |  |
Weighted Average Exercise Price | $ 47.82 |  |
50.00 to 54.27 |  |  |
Share based compensation |  |  |
Number of share options | Option | 128 |  |
Weighted average remaining contractual life | Y | 7 |  |
Weighted Average Exercise Price | $ 52.40 |  |
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 54.27 |  |  |
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 54.27 |  |  |
Share based compensation |  |  |
Exercise price (in dollars per share) | $ 54.27 |  |

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