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Capital Stock - Stock Options Outstanding (Details) shares in Millions | Dec. 31, 2017 USD ($) shares year | Dec. 31, 2016 USD ($) 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 | 0.4 | 2.1 | 2.9
Weighted Average Exercise Price (in dollars per share) | $ 12.14 | $ 8.46 | $ 8.03
Exercisable Options (in shares) | shares | 0.2 |  |
$6.51 - $8.24 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Outstanding Options (in shares) | shares | 0.1 |  |
Weighted Average Exercise Price (in dollars per share) | $ 7.78 |  |
Weighted Average Remaining Life of Outstanding Options | year | 3.5 |  |
Exercisable Options (in shares) | shares | 0.1 |  |
Weighted Average Exercise Price (in dollars per share) | $ 7.78 |  |
$13.38 - $13.38 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price (in dollars per share) | $ 13.38 |  |
Outstanding Options (in shares) | shares | 0.3 |  |
Weighted Average Exercise Price (in dollars per share) | $ 13.38 |  |
Weighted Average Remaining Life of Outstanding Options | year | 7.6 |  |
Exercisable Options (in shares) | shares | 0.1 |  |
Weighted Average Exercise Price (in dollars per share) | $ 13.38 |  |
Bottom of range | $6.51 - $8.24 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price (in dollars per share) | 6.51 |  |
Top of range | $6.51 - $8.24 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise Price (in dollars per share) | $ 8.24 |  |

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