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Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of reconciliation of changes in goodwill [abstract]

Schedule of changes in the carrying amount of goodwill


		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

Schedule of key assumptions used in the determination of recoverable value


		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	%

Schedule of sensitivity to changes in assumptions affecting impairment

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