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Royalty, stream and working interests - Rollforward (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Royalty, Stream and Working Interests, Net  
Balance at beginning of period $ 4,555.6
Acquisitions 133.4
Depletion (118.1)
Impact of foreign exchange 24.9
Balance at end of period 4,595.8
Mineral Royalties  
Royalty, Stream and Working Interests, Net  
Balance at beginning of period 450.1
Depletion (23.0)
Impact of foreign exchange 5.8
Balance at end of period 432.9
Streams  
Royalty, Stream and Working Interests, Net  
Balance at beginning of period 2,967.6
Depletion (74.0)
Balance at end of period 2,893.6
Energy  
Royalty, Stream and Working Interests, Net  
Balance at beginning of period 966.6
Acquisitions 87.6
Depletion (20.8)
Impact of foreign exchange 16.9
Balance at end of period 1,050.3
Advanced  
Royalty, Stream and Working Interests, Net  
Balance at beginning of period 129.8
Acquisitions 45.8
Depletion (0.3)
Impact of foreign exchange 1.7
Balance at end of period 177.0
Exploration  
Royalty, Stream and Working Interests, Net  
Balance at beginning of period 41.5
Impact of foreign exchange 0.5
Balance at end of period $ 42.0