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Revenue - Other Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue.        
Revenue from royalty, streams and working interests $ 257.6 $ 329.9 $ 513.2 $ 606.2
Interest revenue (Note 6a and b) 2.2   3.1  
Other interest income (Note 6c) 0.3   0.6  
Total revenue $ 260.1 $ 329.9 $ 516.9 $ 606.2