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Significant accounting policies - Subsidiaries (Details)	12 Months Ended
	Dec. 31, 2018
Franco-Nevada U.S. Corporation
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada GLW Holdings Corp.
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Mexico Corporation, S.A. de C.V.
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Canada Holdings Corp
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada (Barbados) Corporation
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Australia Pty Ltd
Subsidiaries
Economic Interests (as a percent)	100.00%
FN LGA Pty Ltd.
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada LRC Holdings Corp
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Alberta Holdings ULC
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada U.S. Holding Corp
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Delaware LLC
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Texas LP
Subsidiaries
Economic Interests (as a percent)	100.00%
Minera Global Copper Chile S.A.
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Alberta Corporation
Subsidiaries
Economic Interests (as a percent)	100.00%
FN Subco Inc.
Subsidiaries
Economic Interests (as a percent)	100.00%
Franco-Nevada Idaho Corporation
Subsidiaries
Economic Interests (as a percent)	100.00%
FN Holdings ULC
Subsidiaries
Economic Interests (as a percent)	100.00%
The Mineral Resource Company II, LLC
Subsidiaries
Economic Interests (as a percent)	49.90%
Funding basis (as a percent)	80.00%

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- Definition

The proportion of funding interest in subsidiary.

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- Definition

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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