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East Tank Farm Development (ETFD) (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2017
EAST TANK FARM DEVELOPMENT PARTNERSHIP (ETFD) |  |  |
Distributions to partners |  |  | $ 25.0
Allocated to interest expense |  |  | 5.0
Allocated to principal |  |  | $ 20.0
East Tank Farm Development |  |  |
EAST TANK FARM DEVELOPMENT PARTNERSHIP (ETFD) |  |  |
Gross proceeds | $ 503.0 |  |
Ownership interest (as percent) | 51.00% |  |
Distributions to partners |  | $ 62.0 |
Allocated to interest expense |  | 56.0 |
Allocated to principal |  | $ 6.0 |
East Tank Farm Development | Fort McKay First Nation and the Mikisew Cree First Nation Partnership |  |  |
EAST TANK FARM DEVELOPMENT PARTNERSHIP (ETFD) |  |  |
Ownership interest sold | 49.00% |  |

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