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Significant accounting policies - Deferred share units and Restricted share units (Details) | 12 Months Ended
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Dec. 31, 2018 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
Time-based RSU |
Significant accounting policies |
Vesting period | 3 years
Performance based RSU |
Significant accounting policies |
Vesting period | 3 years
Bottom |
Significant accounting policies |
Target settlement range 0% to 100% | 0.00%
Top |
Significant accounting policies |
Target settlement range 0% to 100% | 100.00%

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

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

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

X
- Definition The percentage of performance and target settlement in share based payment. + References No definition available. + Details
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Namespace Prefix: | fnv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The vesting life of awards in a share-based payment arrangement. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- 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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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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