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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

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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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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