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Share Capital - Range of Exercise Prices of Stock Options (Details) shares in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares $ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 47,646 | 46,685 | 56,036
Weighted average remaining term (years) | 3 years 14 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 38.04 | $ 37.92 | $ 36.67
Stock options exercisable (in shares) | shares | 17,057 | 19,436 |
Weighted average exercise price, options exercisable (in CAD per share) | $ 38.74 | $ 36.03 |
$22.90 - $24.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 2,361 |  |
Weighted average remaining term (years) | 1 year 10 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 22.90 |  |
Stock options exercisable (in shares) | shares | 1,579 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 22.90 |  |
$22.90 - $24.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 22.90 |  |
$22.90 - $24.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 24.99 |  |
$25.00 - $29.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 3,524 |  |
Weighted average remaining term (years) | 1 year 14 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 28.85 |  |
Stock options exercisable (in shares) | shares | 2,236 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 28.85 |  |
$25.00 - $29.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 25.00 |  |
$25.00 - $29.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 29.99 |  |
$30.00 - $34.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 5,174 |  |
Weighted average remaining term (years) | 4 years 11 months 19 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 32.38 |  |
Stock options exercisable (in shares) | shares | 536 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 32.58 |  |
$30.00 - $34.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 30.00 |  |
$30.00 - $34.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 34.99 |  |
$35.00 - $39.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 16,635 |  |
Weighted average remaining term (years) | 3 years 10 months 27 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 36.85 |  |
Stock options exercisable (in shares) | shares | 2,263 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 37.62 |  |
$35.00 - $39.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 35.00 |  |
$35.00 - $39.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 39.99 |  |
$40.00 - $44.99 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 16,117 |  |
Weighted average remaining term (years) | 2 years 2 months 26 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 43.60 |  |
Stock options exercisable (in shares) | shares | 8,939 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 43.58 |  |
$40.00 - $44.99 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 40.00 |  |
$40.00 - $44.99 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 44.99 |  |
$45.00 - $46.74 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding (in shares) | shares | 3,835 |  |
Weighted average remaining term (years) | 3 years 21 days |  |
Weighted average exercise price, options outstanding (in CAD per share) | $ 45.20 |  |
Stock options exercisable (in shares) | shares | 1,504 |  |
Weighted average exercise price, options exercisable (in CAD per share) | $ 45.13 |  |
$45.00 - $46.74 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | 45.00 |  |
$45.00 - $46.74 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Range of exercise prices | $ 46.74 |  |

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