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Share Capital (Details) CAD / shares in Units, shares in Thousands, CAD in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 22, 2016 CAD CAD / shares | Dec. 31, 2017 CAD $ / shares | Dec. 31, 2017 CAD shares | Apr. 26, 2017 CAD
Share Capital |  |  |  |
Common shares issued | CAD 82.2 |  |  |
Common share par value | CAD / shares | CAD 35.00 |  |  |
Gross proceeds from the issue of common shares | CAD 2,878.0 |  |  |
Common shares net, fees Expense | CAD 2,782.0 |  |  |
Treasury share repurchase authorized amount |  |  |  | CAD 2,000.0
Share repurchase activities (in shares) | shares |  |  | 33,154 |
Share repurchase cost |  |  | CAD 1,413.0 |
Average repurchase cost per share | $ / shares |  | $ 42.61 |  |
Liability for share purchase commitment |  | $ 277.0 | 277.0 |
Share capital |  |  |  |
Share Capital |  |  |  |
Share repurchase cost |  |  | 536.0 |
Liability for share purchase commitment |  | 97.0 | 97.0 |
Retained earnings |  |  |  |
Share Capital |  |  |  |
Share repurchase cost |  |  | 877.0 |
Liability for share purchase commitment |  | $ 180.0 | CAD 180.0 |

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