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Significant accounting policies - Deferred share units and Restricted share units (Details) | 12 Months Ended
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Dec. 31, 2017 shares
Deferred Share Units |
Significant accounting policies |
Number of trading days immediately preceding grant date for determining fair value | 5 days
Restricted Share Units |
Significant accounting policies |
The number of trading days immediately preceding the date of the conversion award | 5 days
The number of shares exchanged for each RSU | 1

X
- Definition The number of shares for each other equity instruments vest. + References No definition available. + Details
Name: | fnv_NumberOfSharesForEachOtherEquityInstrumentsVest
Namespace Prefix: | fnv_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of trading days immediately preceding the date of conversion or award grant for determining fair value. + References No definition available. + Details
Name: | fnv_NumberOfTradingDaysImmediatelyPrecedingDateOfIssuanceOfGrantForDeterminingFairValue
Namespace Prefix: | fnv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of trading days immediately preceding grant date of grant for determining fair value. + References No definition available. + Details
Name: | fnv_NumberOfTradingDaysImmediatelyPrecedingGrantDateForDeterminingFairValue
Namespace Prefix: | fnv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=fnv_DeferredShareUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |