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Royalty, Stream and Working Interests, Net - Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Royalty, Stream and Working Interests, Net    
Balance at beginning of period $ 3,668.3 $ 3,257.5
Acquisitions 499.5 745.8
Disposal   (16.2)
Impairments   (67.5)
Depletion (268.9) (267.6)
Impact of foreign exchange 40.3 16.3
Balance at end of period 3,939.2 3,668.3
Mineral Royalties    
Royalty, Stream and Working Interests, Net    
Balance at beginning of period 488.0 538.2
Disposal   (16.2)
Transfers 42.1 6.2
Depletion (52.3) (52.1)
Impact of foreign exchange 8.3 11.9
Balance at end of period 486.1 488.0
Streams    
Royalty, Stream and Working Interests, Net    
Balance at beginning of period 2,502.2 2,122.3
Acquisitions 265.8 642.8
Impairments   (67.4)
Depletion (192.6) (195.5)
Balance at end of period 2,575.4 2,502.2
Oil And Gas    
Royalty, Stream and Working Interests, Net    
Balance at beginning of period 448.9 356.3
Acquisitions 232.7 101.3
Depletion (23.0) (19.1)
Impact of foreign exchange 24.1 10.4
Balance at end of period 682.7 448.9
Advanced    
Royalty, Stream and Working Interests, Net    
Balance at beginning of period 188.8 200.4
Acquisitions   1.7
Transfers (43.2) (6.2)
Depletion (1.0) (0.7)
Impact of foreign exchange 7.3 (6.4)
Balance at end of period 151.9 188.8
Exploration    
Royalty, Stream and Working Interests, Net    
Balance at beginning of period 40.4 40.3
Acquisitions 1.0  
Transfers 1.1  
Impairments   (0.1)
Depletion   (0.2)
Impact of foreign exchange 0.6 0.4
Balance at end of period $ 43.1 $ 40.4