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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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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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Namespace Prefix: | fnv_
Data Type: | xbrli:monetaryItemType
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
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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