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Employee Future Benefits (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 CAD ($) year | Dec. 31, 2018 CAD ($) age | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Administration expenses | $ 1.0 |  |  |  | $ 2.0 | $ 2.0
Weighted average duration of defined benefit obligation | year |  |  | 14 |  |  |
Minimum |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Employer contribution (as percent) |  | 500.00% |  |  |  |
Maximum |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Employer contribution (as percent) |  | 1000.00% |  |  |  |
Registered Pension Plan |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Administration expenses | 1.0 |  |  |  | 2.0 | 2.0
Registered Pension Plan | Letter of credit |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Letter of credit, posted | 80.0 | $ 80.0 | $ 80.0 | $ 80.0 |  |
Supplemental Pension Plan |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Administration expenses | 0.0 |  |  |  | 0.0 | 0.0
Other Post-Employment Benefit Plans |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Maximum age disabled and retired members eligible for benefits |  | 65 |  | 65 |  |
Administration expenses | 0.0 |  |  |  | 0.0 | $ 0.0
Related parties [member] | Registered Pension Plan |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |
Administration expenses | $ 0.1 |  |  |  | $ 0.1 |

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