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Income Taxes - Income tax losses carried forward (Details) - CAD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | $ 1,013,730,000 | $ 1,048,264,000
Unused tax loss carry forward | 2,399,647,000 |
Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 971,887,000 |
US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 276,121,000 |
Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 1,151,639,000 |
Unused tax expiry 2026 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 13,819,000 |
Unused tax expiry 2026 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2026 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2026 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 13,819,000 |
Unused tax expiry 2027 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 2,841,000 |
Unused tax expiry 2027 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2027 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2027 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 2,841,000 |
Unused tax expiry 2030 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 47,000 |
Unused tax expiry 2030 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 47,000 |
Unused tax expiry 2030 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2030 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2031 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 20,436,000 |
Unused tax expiry 2031 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2031 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 20,436,000 |
Unused tax expiry 2031 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2032 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 22,282,000 |
Unused tax expiry 2032 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 272,000 |
Unused tax expiry 2032 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 22,010,000 |
Unused tax expiry 2032 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2033 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 44,557,000 |
Unused tax expiry 2033 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 7,037,000 |
Unused tax expiry 2033 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 37,520,000 |
Unused tax expiry 2033 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2034 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 390,586,000 |
Unused tax expiry 2034 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 365,039,000 |
Unused tax expiry 2034 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 20,697,000 |
Unused tax expiry 2034 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 4,850,000 |
Unused tax expiry 2035 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 394,529,000 |
Unused tax expiry 2035 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 372,376,000 |
Unused tax expiry 2035 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 14,401,000 |
Unused tax expiry 2035 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 7,752,000 |
Unused tax expiry 2036 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 261,174,000 |
Unused tax expiry 2036 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 211,299,000 |
Unused tax expiry 2036 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 43,769,000 |
Unused tax expiry 2036 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 6,106,000 |
Unused tax expiry 2037 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 33,226,000 |
Unused tax expiry 2037 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 143,000 |
Unused tax expiry 2037 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 32,785,000 |
Unused tax expiry 2037 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 298,000 |
Unused tax expiry 2038 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 40,938,000 |
Unused tax expiry 2038 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 5,581,000 |
Unused tax expiry 2038 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 35,357,000 |
Unused tax expiry 2038 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2039 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 33,772,000 |
Unused tax expiry 2039 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 6,424,000 |
Unused tax expiry 2039 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 27,348,000 |
Unused tax expiry 2039 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2040 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 25,467,000 |
Unused tax expiry 2040 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 3,669,000 |
Unused tax expiry 2040 [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 21,798,000 |
Unused tax expiry 2040 [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry no expiry [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 1,115,973,000 |
Unused tax expiry no expiry [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry no expiry [Member] | US [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry no expiry [Member] | Other [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | $ 1,115,973,000 |

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