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Income taxes - DTA and DTL (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-capital loss      
Net deferred tax assets $ 17.3 $ 14.5  
Net deferred tax liabilities 67.3 60.3  
Deferred income tax liabilities, net 50.0 45.8 $ 16.2
Within 12 months      
Non-capital loss      
Net deferred tax assets 0.1 0.1  
Net deferred tax liabilities 1.0 0.9  
After more than 12 months      
Non-capital loss      
Net deferred tax assets 17.2 14.4  
Net deferred tax liabilities 66.3 59.4  
Share issue and debt issue costs deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (3.7) (7.1)  
Royalty stream and working interests deferred income tax assets      
Non-capital loss      
Net deferred tax assets 16.2 5.6  
Royalty stream and working interests deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities 74.8 71.1  
Non-capital loss carry-forwards deferred income tax assets      
Non-capital loss      
Net deferred tax assets 1.9 9.5  
Non-capital loss carry-forwards deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (2.6) (5.6)  
Investments deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities 2.5 5.8  
Other deferred income tax assets      
Non-capital loss      
Net deferred tax assets (0.8) (0.6)  
Other deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities $ (3.7) $ (3.9)