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Capital Stock - Schedule of Stock Options Outstanding (Details) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 shares $ / shares | 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] |  |  |  |
Outstanding Options (in shares) | shares | 0.3 | 0.3 | 0.3 | 0.4
Weighted average exercise price of share options outstanding in share-based payment arrangement (in dollars per share) | $ 12.78 | $ 12.50 | $ 11.93 | $ 12.14
Weighted average remaining contractual life of outstanding share options | 4 years 2 months 12 days |  |  |
Exercisable Options (in shares) | shares | 0.3 |  |  |
Weighted average exercise price of share options exercisable in share-based payment arrangement (in usd per share) | $ 12.78 |  |  |
Bottom of range |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in dollars per share) | 6.35 |  |  |
Top of range |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in dollars per share) | $ 13.46 |  |  |

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