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Significant accounting policies - Subsidiaries (Details)	12 Months Ended
	Dec. 31, 2017
Franco-Nevada U.S. Corporation
Subsidiaries
Economic Interests	100.00%
Franco-Nevada GLW Holdings Corp.
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Mexico Corporation, S.A. de C.V.
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Canada Holdings Corp
Subsidiaries
Economic Interests	100.00%
Franco-Nevada (Barbados) Corporation
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Australia Pty Ltd
Subsidiaries
Economic Interests	100.00%
Franco-Nevada LRC Holdings Corp
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Alberta Holdings ULC
Subsidiaries
Economic Interests	100.00%
Franco-Nevada U.S. Holding Corp
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Delaware LLC
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Texas LP
Subsidiaries
Economic Interests	100.00%
Minera Global Copper Chile S.A.
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Alberta Corporation
Subsidiaries
Economic Interests	100.00%
FN Subco Inc.
Subsidiaries
Economic Interests	100.00%
Franco-Nevada Idaho Corporation
Subsidiaries
Economic Interests	100.00%
FN Holdings ULC
Subsidiaries
Economic Interests	100.00%

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- Definition

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The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

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