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Income taxes - Movement in net deferred tax liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income taxes
Balance, beginning of year	$ 75.6	$ 50.0
Recognized in net income	(35.2)	22.5
Recognized in other comprehensive income	6.7	1.5
Recognized in equity	0.3	0.4
Other	(1.0)	1.2
Balance, end of year	$ 46.4	$ 75.6

X

- Definition

The deferred amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

No definition available.

+ Details

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Namespace Prefix:	fnv_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of deferred tax related to other items.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph g
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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X

- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_a&doctype=Standard
-URIDate 2020-01-01

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X

- References

No definition available.

+ Details

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