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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Unrealized change in market value of available-for-sale, tax expense	$ 6.1	$ 5.3
Realized change in market value of available-for-dale, tax expense	$ 0.2	$ 6.0

X

- Definition

Represents income tax relating to reclassification of available-for-sale financial assets of other comprehensive income.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of unrealized income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets.

+ References

No definition available.

+ Details

Name:	fnv_IncomeTaxRelatingToUnrealizedAvailableForSaleFinancialAssetsOfOtherComprehensiveIncome
Namespace Prefix:	fnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration