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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

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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 -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_75_a&doctype=Standard -URIDate 2019-03-27 + Details
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