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Income taxes (Income tax losses carried forward) (Details) - CAD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | $ 1,542,137,000 | $ 1,447,529,000
Unused tax loss carry forward | 1,827,706,000 | $ 1,760,518,000
Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 702,000 |
United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 710,245,000 |
Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 1,116,759,000 |
Unused tax expiry 2026 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 15,543,000 |
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] | United States [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 | 15,543,000 |
Unused tax expiry 2027 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 295,000 |
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] | United States [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 | 295,000 |
Unused tax expiry 2028 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 120,000 |
Unused tax expiry 2028 [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 2028 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2028 [Member] | Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 120,000 |
Unused tax expiry 2029 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 13,440,000 |
Unused tax expiry 2029 [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 2029 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2029 [Member] | Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 13,393,000 |
Unused tax expiry 2030 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 2,145,000 |
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 | 0 |
Unused tax expiry 2030 [Member] | United States [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 | 2,145,000 |
Unused tax expiry 2031 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 65,781,000 |
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] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 23,100,000 |
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 | 42,681,000 |
Unused tax expiry 2032 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 25,151,000 |
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] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 24,879,000 |
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 | 38,240,000 |
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 | 0 |
Unused tax expiry 2033 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 38,240,000 |
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 | 22,224,000 |
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 | 0 |
Unused tax expiry 2034 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 17,748,000 |
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 | 4,476,000 |
Unused tax expiry 2035 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 15,514,000 |
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 | 0 |
Unused tax expiry 2035 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 8,089,000 |
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 | 7,425,000 |
Unused tax expiry 2036 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 55,324,000 |
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 | 0 |
Unused tax expiry 2036 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 49,475,000 |
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 | 5,849,000 |
Unused tax expiry 2037 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 40,150,000 |
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 | 27,000 |
Unused tax expiry 2037 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 37,059,000 |
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 | 3,064,000 |
Unused tax expiry 2038 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 328,000 |
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 | 0 |
Unused tax expiry 2038 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
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 | 328,000 |
Unused tax expiry 2039 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 209,000 |
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 | 66,000 |
Unused tax expiry 2039 [Member] | United States [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] | Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 143,000 |
Unused tax expiry 2040 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 409,000 |
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 | 37,000 |
Unused tax expiry 2040 [Member] | United States [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] | Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 372,000 |
Unused tax expiry 2041 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 243,000 |
Unused tax expiry 2041 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 77,000 |
Unused tax expiry 2041 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2041 [Member] | Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 166,000 |
Unused tax expiry 2042 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 49,000 |
Unused tax expiry 2042 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 49,000 |
Unused tax expiry 2042 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2042 [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 2043 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 71,000 |
Unused tax expiry 2043 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 71,000 |
Unused tax expiry 2043 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2043 [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 2044 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 56,000 |
Unused tax expiry 2044 [Member] | Canada [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 56,000 |
Unused tax expiry 2044 [Member] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 0 |
Unused tax expiry 2044 [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 | 1,532,414,000 |
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] | United States [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax loss carry forward | 511,655,000 |
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 | $ 1,020,759,000 |

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