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Income taxes - DTA and DTL (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Non-capital loss      
Net deferred tax assets $ 6.8 $ 17.3  
Net deferred tax liabilities 82.4 67.3  
Deferred income tax liabilities, net 75.6 50.0 $ 45.8
Share issue and debt issue costs deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (1.7) (3.7)  
Royalty stream and working interests deferred income tax assets      
Non-capital loss      
Net deferred tax assets 6.5 16.2  
Royalty stream and working interests deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities 89.0 74.8  
Non-capital loss carry-forwards deferred income tax assets      
Non-capital loss      
Net deferred tax assets 0.3 1.9  
Non-capital loss carry-forwards deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (4.3) (2.6)  
Investments deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities 4.3 2.5  
Other deferred income tax assets      
Non-capital loss      
Net deferred tax assets   (0.8)  
Other deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities $ (4.9) $ (3.7)