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Shareholders' equity - At-the-market equity offering (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 19, 2019 | Sep. 30, 2019 | Dec. 31, 2019
Shareholders' equity |  |  |
Maximum value of shares that can be issued from treasury to public | 200,000,000 |  |
Average price per common share |  | $ 96.56 |
Gross proceeds from share issues |  | $ 138.4 |
Net proceeds from share issues |  | 136.0 |
Share issuance agent commission costs |  | 1.4 |
Share issue costs and expense |  | $ 1.0 |
Share Capital (Note 19) |  |  |
Shareholders' equity |  |  |
Number of shares issued at At-the-market equity offering |  |  | 1,433,400

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