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Goodwill | 12 Months Ended
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Dec. 31, 2018
Disclosure of reconciliation of changes in goodwill [abstract] |
Goodwill | 7. Goodwill Changes in the carrying amount of goodwill during the years ended December 31, are as follows:
|  | January 1, |  | Impairment |  | Exchange |  | December 31, |  | Impairment |  | Exchange |  | December 31,
|  | 2017 |  | (Note 25.5) |  | differences |  | 2017 |  | (Note 25.5) |  | differences |  | 2018
|  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000
Globe Specially Metals, Inc. (Globe) |  | 230,210 |  | (30,618) |  | 5,695 |  | 205,287 |  | — |  | (2,439) |  | 202,848
Total |  | 230,210 |  | (30,618) |  | 5,695 |  | 205,287 |  | — |  | (2,439) |  | 202,848
In accordance with the requirements of IAS 36, goodwill is tested for impairment annually and is tested for impairment between annual tests if a triggering event occurs that would indicate the carrying amount of a cash-generating unit may be impaired. Impairment testing for goodwill is done at a cash-generating unit level, and the Company performs its annual impairment test at the end of the annual reporting period (December 31). The estimate of the recoverable value of the cash-generating units requires significant judgment in evaluation of overall market conditions, estimated future cash flows, discount rates and other factors, and are calculated based on management’s business plans. On December 23, 2015, Ferroglobe PLC consummated the acquisition of 100% of the equity interests of Globe Specialty Metals, Inc. and subsidiaries and FerroAtlántica. This Business Combination was accounted for using the acquisition method of accounting for business combinations under IFRS 3 Business Combinations, with FerroAtlántica treated as the accounting acquirer and GSM as the acquiree. The aggregate of the fair values as of the closing date of the Business Combination of the assets acquired and liabilities assumed was recorded as goodwill. During the year ended December 31, 2018, in connection with our annual goodwill impairment test, the Company did not recognize an impairment charge. During the year ended December 31, 2017, in connection with our annual goodwill impairment test, the Company recognized an impairment charge of $30,618 thousand related to the partial impairment of goodwill in Canada, resulting from a decline in future estimated sales prices and a decrease in our estimated long-term growth rate which caused the Company to revise its expected future cash flows from its Canadian business operations. The impairment charge is recorded within the Electrometallurgy – North America reportable segment. Ferroglobe operates in a cyclical market, and silicon and silicon-based alloy index pricing and foreign import pressure into the U.S. and Canadian markets impact the future projected cash flows used in our impairment analysis. Recoverable value was estimated based on discounted cash flows. Estimates under the Company’s discounted income based approach involve numerous variables including anticipated sales price and volumes, cost structure, discount rates and long term growth that are subject to change as business conditions change, and therefore could impact fair values in the future. As of December 31, 2018, the remaining goodwill for the U.S and Canadian cash-generating units is $172,913 thousand and $29,935 thousand, respectively. Key assumptions used in the determination of recoverable value In determining the asset recoverability through value in use, management makes estimates, judgments and assumptions on uncertain matters. For each cash-generating unit, the value in use is determined based on economic assumptions and forecasted operating conditions as follows:
|  | 2018 |  |  | 2017 |
|  | U.S. |  | Canada |  |  | U.S. |  | Canada |
Weighted average cost of capital |  | 11.0 | % | 10.5 | % |  | 10.5 | % | 10.5 | %
Long-term growth rate |  | 2.0 | % | 2.0 | % |  | 1.5 | % | 1.5 | %
Normalized tax rate |  | 22.0 | % | 26.5 | % |  | 27.1 | % | 26.5 | %
Normalized cash free net working capital |  | 21.0 | % | 21.0 | % |  | 21.0 | % | 21.0 | %
The Company has defined a financial model which considers the revenues, expenditures, cash flows, net tax payments and capital expenditures on a five year period (2019‑2023), and perpetuity beyond this tranche. The financial projections to determine the net present value of future cash flows are modeled considering the principal variables that determine the historic flows of each group of cash-generating unit. Sensitivity to changes in assumptions Changing management’s assumptions, could significantly affect the evaluation of the value in use of our cash generating units and, therefore, the impairment result. The following changes to the assumptions used in the impairment test lead to the following:
|  |  |  | Excess of |  | Sensitivity on |  | Sensitivity on |  | Sensitivity on
|  |  |  | recoverable |  | discount rate |  | long-term growth rate |  | cash flows
|  |  |  | value over |  | Decrease |  | Increase |  | Decrease |  | Increase |  | Decrease |  | Increase
|  | Goodwill |  | carrying value |  | by 10% |  | by 10% |  | by 10% |  | by 10% |  | by 10% |  | by 10%
|  | (in millions of US$)
Electrometallurgy - U.S. |  | 172.9 |  | 43.2 |  | 94.4 |  | (73.7) |  | (11.0) |  | 11.5 |  | (59.7) |  | 59.7
Electrometallurgy - Canada |  | 29.9 |  | 4.8 |  | 17.7 |  | (13.8) |  | (2.2) |  | 2.3 |  | (12.1) |  | 12.1
Total |  | 202.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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