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Capital Stock - Stock Options Outstanding (Details) shares in Millions | Dec. 31, 2018 USD ($) shares year | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
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Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Outstanding Options (in shares) | shares | 0.3 | 0.4 | 2.1 | 2.9
Weighted Average Exercise Price (in dollars per share) | $ 11.93 | $ 12.14 | $ 8.46 | $ 8.03
$6.06 - $12.85 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Outstanding Options (in shares) | shares | 0.3 |  |  |
Weighted Average Exercise Price (in dollars per share) | $ 11.93 |  |  |
Weighted Average Remaining Life of Outstanding Options | year | 6.2 |  |  |
Exercisable Options (in shares) | shares | 0.3 |  |  |
Weighted Average Exercise Price (in dollars per share) | $ 11.68 |  |  |
Bottom of range | $6.06 - $12.85 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Exercise Price (in dollars per share) | 6.06 |  |  |
Top of range | $6.06 - $12.85 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Exercise Price (in dollars per share) | $ 12.85 |  |  |

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