Costs of sales (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Costs of sales
Cost of stream sales	$ 25.7	$ 29.7	$ 52.7	$ 66.1
Cost of prepaid ounces	1.8	2.3	3.7	4.1
Mineral production taxes	0.8	0.7	1.1	1.3
Oil & gas operating costs	1.5	1.2	2.5	2.3
Total costs of sales	$ 29.8	$ 33.9	$ 60.0	$ 73.8

The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories but excluding depletion and depreciation expense.

No definition available.

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