Royalty, stream and working interests - Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Royalty, Stream and Working Interests, Net
Balance at beginning of period	$ 4,555.6	$ 3,939.2
Acquisitions	476.9	988.6
Impairments		(76.0)
Depletion	(259.7)	(243.9)
Impact of foreign exchange	25.0	(52.3)
Balance at end of period	4,797.8	4,555.6
Mineral Royalties
Royalty, Stream and Working Interests, Net
Balance at beginning of period	450.1	486.1
Acquisitions		0.5
Transfers	5.9	16.4
Depletion	(46.0)	(42.5)
Impact of foreign exchange	5.6	(10.4)
Balance at end of period	415.6	450.1
Streams
Royalty, Stream and Working Interests, Net
Balance at beginning of period	2,967.6	2,575.4
Acquisitions		630.4
Impairments		(75.4)
Depletion	(163.6)	(162.8)
Balance at end of period	2,804.0	2,967.6
Energy
Royalty, Stream and Working Interests, Net
Balance at beginning of period	966.6	682.7
Acquisitions	419.0	354.5
Depletion	(49.0)	(37.3)
Impact of foreign exchange	17.0	(33.3)
Balance at end of period	1,353.6	966.6
Advanced
Royalty, Stream and Working Interests, Net
Balance at beginning of period	129.8	151.9
Acquisitions	46.0	1.8
Transfers	(5.9)	(16.4)
Depletion	(0.9)	(1.1)
Impact of foreign exchange	1.9	(6.4)
Balance at end of period	170.9	129.8
Exploration
Royalty, Stream and Working Interests, Net
Balance at beginning of period	41.5	43.1
Acquisitions	11.9	1.4
Impairments		(0.6)
Depletion	(0.2)	(0.2)
Impact of foreign exchange	0.5	(2.2)
Balance at end of period	$ 53.7	$ 41.5

Acquisitions of property plant and equipment.

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- Definition

The amount of royalty, stream and working interests, net.

+ References

No definition available.

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- Definition

The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

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The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment]

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