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Share capital - Share-based payment expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Share capital |  |
Total share-based payment expenses | $ 3.3 | $ 15.4
Share-based payment expenses recognized in operating expenses | 1.1 | 7.8
Stock option expense |  |
Share capital |  |
Total share-based payment expenses | 1.1 | 0.8
Performance share unit expense |  |
Share capital |  |
Total share-based payment expenses | 1.6 | 1.4
Restricted share unit expense |  |
Share capital |  |
Total share-based payment expenses | 1.4 | 8.4
Deferred share unit expense |  |
Share capital |  |
Total share-based payment expenses | (0.7) | 3.6
Shares issued under First Nations agreements |  |
Share capital |  |
Total share-based payment expenses | $ (0.1) | $ 1.2

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- Definition Amount of share based compensation expenses recognized in operating expenses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share capital. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of share-based payment including operating expenses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Details
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- Details
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- Details
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- Details
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