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Share-Based Payments - Share Based Options by Exercise Price (Details) shares in Thousands | Dec. 31, 2018 CAD ($) shares year | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
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Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options (thousands) | shares | 3,101 | 3,008 | 3,397
Weighted average remaining contractual life (years) | year | 5.49 |  |
Weighted average exercise price (in CAD per share) | $ 37.06 | $ 33.88 | $ 34.19
$18.00 to $24.00 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options (thousands) | shares | 624 |  |
Weighted average remaining contractual life (years) | year | 2.63 |  |
Weighted average exercise price (in CAD per share) | $ 21.28 |  |
$18.00 to $24.00 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | 18.00 |  |
$18.00 to $24.00 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | $ 24.00 |  |
$24.01 to $30.00 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options (thousands) | shares | 350 |  |
Weighted average remaining contractual life (years) | year | 3.74 |  |
Weighted average exercise price (in CAD per share) | $ 27.79 |  |
$24.01 to $30.00 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | 24.01 |  |
$24.01 to $30.00 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | $ 30 |  |
$30.01 to $35.00 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options (thousands) | shares | 308 |  |
Weighted average remaining contractual life (years) | year | 1.82 |  |
Weighted average exercise price (in CAD per share) | $ 31.11 |  |
$30.01 to $35.00 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | 30.01 |  |
$30.01 to $35.00 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | $ 35 |  |
$35.01 to $45.00 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options (thousands) | shares | 949 |  |
Weighted average remaining contractual life (years) | year | 6.23 |  |
Weighted average exercise price (in CAD per share) | $ 39.45 |  |
$35.01 to $45.00 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | 35.01 |  |
$35.01 to $45.00 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | $ 45 |  |
$45.01 to $53.96 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options (thousands) | shares | 870 |  |
Weighted average remaining contractual life (years) | year | 8.75 |  |
Weighted average exercise price (in CAD per share) | $ 51.62 |  |
$45.01 to $53.96 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | 45.01 |  |
$45.01 to $53.96 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices (in CAD per share) | $ 53.96 |  |

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