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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Summary of Contract Liability
The following table presents a rollforward of the Franco-Nevada contract liability balance:
 
Year ended December 31,
In thousands
2018
 
2017
2016
Opening Balance
$
14,883

 
$
19,281

$
20,000

Revenue Recognized
(1,965
)
 
(4,398
)
(719
)
Closing Balance
$
12,918

 
$
14,883

$
19,281