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Significant accounting policies - Deferred share units and Restricted share units (Details)	12 Months Ended
	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

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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

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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

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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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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