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Income Taxes - DTA and DTL (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Non-capital loss      
Deferred income tax liabilities, net $ 143.1 $ 113.1 $ 86.0
Share issue and debt issue costs deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (0.3) (0.3)  
Royalty stream and working interests deferred income tax assets      
Non-capital loss      
Net deferred tax assets 28.7 34.1  
Royalty stream and working interests deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities 179.9 156.4  
Non-capital loss carry-forwards deferred income tax assets      
Non-capital loss      
Net deferred tax assets 7.9 6.6  
Non-capital loss carry-forwards deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (2.8) (2.6)  
Investments deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities 10.1 7.5  
Other deferred income tax assets      
Non-capital loss      
Net deferred tax assets 0.4 (0.8)  
Other deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities (6.8) (8.0)  
Deferred income tax assets      
Non-capital loss      
Net deferred tax assets 37.0 39.9  
Deferred income tax liabilities      
Non-capital loss      
Net deferred tax liabilities $ 180.1 $ 153.0