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Other Transactions (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 29, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | May 31, 2018 USD ($) | May 31, 2018 CAD ($) | Mar. 23, 2018 CAD ($)
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |
Proceeds from disposal of assets |  |  | $ 84.0 | $ 1,611.0 |  |  |
Gain on sale of business |  |  | 24.0 | $ 602.0 |  |  |
Exploration and Production |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |
Gain on sale of business |  |  | (91.0) |  |  |  |
Fenja Development Project |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |
Interest purchased (as a percent) |  |  |  |  | 17.50% | 17.50% |
Consideration paid |  |  |  |  | $ 55 | $ 70.0 |
Interim settlement costs |  |  |  |  |  | $ 22.0 |
Canbriam Energy, Inc. |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |
Interest purchased (as a percent) |  |  |  |  |  |  | 37.00%
Consideration paid |  |  |  |  |  |  | $ 52.0
Net loss related to write down of equity method investment |  | $ 90.0 |  |  |  |  |
Remaining carrying value of company's interest |  | $ 0.0 | $ 0.0 |  |  |  |
Joslyn Oil Sands Mining Project |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |
Percentage of working interest agreed to sell | 36.75% |  |  |  |  |  |
Gross proceeds | $ 82.7 |  |  |  |  |  |
Proceeds from disposal of assets | 36.8 |  |  |  |  |  |
Total receivable | 45.9 |  |  |  |  |  |
Long term receivable | 36.7 |  |  |  |  |  |
Current receivable | $ 9.2 |  |  |  |  |  |
Other receivable term | 5 years |  |  |  |  |  |
Gain on sale of business | $ 83.0 |  |  |  |  |  |
Suncor With the Other Working Interest Partners | Joslyn Oil Sands Mining Project |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |
Percentage of working interest agreed to sell | 100.00% |  |  |  |  |  |
Gross proceeds | $ 225.0 |  |  |  |  |  |
Proceeds from disposal of assets | 100.0 |  |  |  |  |  |
Total receivable | $ 125.0 |  |  |  |  |  |

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