Royalty, stream and working interests - Rollforward (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Royalty, Stream and Working Interests, Net
Balance at beginning of period	$ 4,797.8	$ 4,555.6
Acquisitions	34.6	476.9
Impairments	(267.7)
Depletion	(115.5)	(259.7)
Impact of foreign exchange	(25.4)	25.0
Balance at end of period	4,423.8	4,797.8
Mineral Royalties
Royalty, Stream and Working Interests, Net
Balance at beginning of period	415.6	450.1
Acquisitions	13.4
Transfers		5.9
Depletion	(17.1)	(46.0)
Impact of foreign exchange	(6.3)	5.6
Balance at end of period	405.6	415.6
Streams
Royalty, Stream and Working Interests, Net
Balance at beginning of period	2,804.0	2,967.6
Acquisitions	(0.1)
Depletion	(76.5)	(163.6)
Balance at end of period	2,727.4	2,804.0
Energy
Royalty, Stream and Working Interests, Net
Balance at beginning of period	1,353.6	966.6
Acquisitions	21.3	419.0
Impairments	(267.7)
Depletion	(21.5)	(49.0)
Impact of foreign exchange	(15.2)	17.0
Balance at end of period	1,070.5	1,353.6
Advanced
Royalty, Stream and Working Interests, Net
Balance at beginning of period	170.9	129.8
Acquisitions		46.0
Transfers		(5.9)
Depletion	(0.4)	(0.9)
Impact of foreign exchange	(2.8)	1.9
Balance at end of period	167.7	170.9
Exploration
Royalty, Stream and Working Interests, Net
Balance at beginning of period	53.7	41.5
Acquisitions		11.9
Depletion		(0.2)
Impact of foreign exchange	(1.1)	0.5
Balance at end of period	$ 52.6	$ 53.7

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.

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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

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