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Share capital (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 $ / shares
Disclosure of classes of share capital [abstract] |  |  |
Beginning balance (in shares) | shares | 680,250,000 | 675,957,000 |
Common shares, beginning of period | $ 3,154.0 | $ 3,144.5 |
Issuance of common shares under First Nations agreements (in shares) | shares | 250,000 | 350,000 |
Issuance of shares under First Nations agreements and land purchases | $ 0.4 | $ 0.7 |
Issuance of flow through shares (in shares) | shares |  | 3,824,000 |
Issuance of flow through shares |  | $ 8.6 |
Exercise of options and vested performance share units (in shares) | shares | 646,000 | 119,000 |
Exercise of options and vested performance share units | $ 1.0 | $ 0.2 |
Ending balance (in shares) | shares | 681,146,000 | 680,250,000 |
Common shares, end of period | $ 3,155.4 | $ 3,154.0 |
Proceeds received from issuance of shares | $ 0.2 | $ 10.2 |
Shares issued in equity offering, price per share (in dollars per share) | $ / shares |  |  | $ 3.40

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