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Costs of sales (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Costs of sales |  |
Cost of stream sales | $ 149.5 | $ 135.1
Mineral production taxes | 2.9 | 2.4
Mining costs of sales | 152.4 | 137.5
Energy costs of sales | 6.4 | 7.3
Total costs of sales | $ 158.8 | $ 144.8

X
- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories but excluding depletion and depreciation expense. + References No definition available. + Details
Name: | fnv_CostOfSalesExcludingDepletionAndDepreciationExpense
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition No definition. + References No definition available. + Details
Name: | fnv_CostsOfSalesAbstract
Namespace Prefix: | fnv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of costs relating to energy. + References No definition available. + Details
Name: | fnv_EnergyOperatingCosts
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of costs relating to mineral production taxes. + References No definition available. + Details
Name: | fnv_MineralProductionTaxes
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of costs relating to mining. + References No definition available. + Details
Name: | fnv_MiningOperatingCosts
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of costs relating to per ounce stream purchase cost. + References No definition available. + Details
Name: | fnv_PerOunceStreamPurchaseCost
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration