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Significant accounting policies - Other (Details) $ in Millions | Jan. 02, 2018 USD ($) | Jan. 01, 2018 USD ($) item
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Significant accounting policies |  |
Impact on adoption of IFRS 9 | $ 27.1 |
Number of equity investments accounted for at cost | item |  | 1
Carrying value |  | $ 4.0
Number of loan receivable carried at amortized cost | item |  | 1
Loan receivable at amortized cost |  | $ 30.1

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

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- Definition Amount after tax of changes in equity or changes in net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | fnv_IfrsCumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying value of investments designated as held at cost. + References No definition available. + Details
Name: | fnv_InvestmentCarryingValue
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of loan receivable at amortized cost. + References No definition available. + Details
Name: | fnv_LoanReceivableAmortizedCost
Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of equity investments accounted for at cost. + References No definition available. + Details
Name: | fnv_NumberOfEquityInvestmentsAccountedForAtCost
Namespace Prefix: | fnv_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of loan receivable accounted for at amortized cost. + References No definition available. + Details
Name: | fnv_NumberOfLoanReceivableAccountedForAtAmortizedCost
Namespace Prefix: | fnv_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant