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Acquisition of El Pilar mine (Tables) | 9 Months Ended
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Sep. 30, 2015
Acquisition of El Pilar mine |
Schedule of recognized amounts of identifiable assets acquired and liabilities assumed | Recognized amounts of identifiable assets acquired and liabilities assumed (in millions)
Financial assets |  | $ | 0.1 |
Mineral resources |  | 23.4 |
Property, plant and equipment |  | 10.5 |
Financial liabilities |  | (3.6 | )
Total identifiable net assets |  | $ | 30.4 |
Goodwill |  | $ | 70.0 |
Schedule of changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill for the nine months ended September 30, 2015 are as follows (in millions):
Balance as of January 1, 2015 |  | $ | 17.0 |
Goodwill acquired |  | 70.0 |
Impairment losses |  | — |
Balance as of September 30, 2015 |  | $ | 87.0 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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