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Significant Events - Strategic Investment by Brookfield (Details) - CAD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 25, 2019 | May 01, 2019 | Mar. 25, 2019 | Oct. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |  |  |  |  |
Proceeds on sale of Wintering Hills facility and Solomon disposition (Note 4) |  |  |  |  | $ 0.0 | $ 2.0 | $ 478.0
7% Unsecured Subordinated Debentures Due May 1, 2039 |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Interest rate |  | 7.00% |  |  | 7.00% |  |
Investment Agreement |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  | $ 7.5 |  |
Commitment fee |  |  |  |  | 15.0 |  |
Capital commitments |  |  |  |  | $ 250.0 |  |
Investment Agreement | Brookfield Renewable Partners |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Proceeds on sale of Wintering Hills facility and Solomon disposition (Note 4) | $ 750.0 |  | $ 750.0 |  |  |  |
Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities |  | $ 350.0 |  | $ 400.0 |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  | 9.00% |  |
Par value per share |  |  |  |  | $ 10 |  |
Fee expected to be paid for advice and recommendations in connection of operations |  |  |  |  | $ 1.5 |  |

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