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Significant accounting policies - New Accounting Standards Issued But Not Yet Effective (Details) $ in Millions | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item
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Significant accounting policies |  |
Number of equity investments accounted for at cost | item | 1 | 1
Carrying value | $ | $ 4.1 | $ 3.8
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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- Definition Carrying value of investments designated as held at cost. + References No definition available. + Details
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Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Value of loan receivable at amortized cost. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The number of equity investments accounted for at cost. + References No definition available. + Details
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- Definition The number of loan receivable accounted for at amortized cost. + References No definition available. + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
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