Costs of sales (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Costs of sales
Per ounce stream purchase cost	$ 127.4	$ 95.6
Cost of prepaid ounces	7.7	6.5
Mineral production taxes	2.3	0.5
Oil & gas operating costs	4.6	3.2
Total costs of sales	$ 142.0	$ 105.8

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