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Other Charges - Annual Impairment Assessment (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2016
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | $ 12,200,000 |  | $ 0 | $ 0 | $ 12,200,000 |
Impairment | $ 0 |  | $ 0 |  |  |  | $ 21,200,000 | $ 12,200,000 |
Growth rate used to extrapolate cash flow projections | 2.00% |  |  |  | 2.00% | 2.00% |  |  |
Discount rate applied to cash flow projections | 9.00% |  | 10.00% | 8.00% | 9.00% | 9.00% | 10.00% | 8.00% |
Goodwill | $ 23,200,000 |  | $ 23,200,000 |  | $ 23,200,000 | $ 23,200,000 | $ 23,200,000 |  |
Term used to extrapolate cash flow projections |  |  |  |  |  | 4 years |  |  |
Semiconductor Cash-generating unit |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections | 9.00% |  | 7.00% |  | 9.00% | 9.00% | 7.00% |  |
Discount rate applied to cash flow projections | 17.00% |  | 17.00% | 17.00% | 17.00% | 17.00% | 17.00% | 17.00% |
Goodwill | $ 19,500,000 |  | $ 19,500,000 |  | $ 19,500,000 | $ 19,500,000 | $ 19,500,000 |  |
Term used to extrapolate cash flow projections |  |  |  |  |  | 6 years | 7 years |  |
Karel |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Goodwill | $ 3,700,000 |  | $ 3,700,000 |  | 3,700,000 | $ 3,700,000 | $ 3,700,000 |  | $ 3,700,000
Japan | Cash-generating units |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | $ 6,500,000 |  |  |  |  |
Spain | Cash-generating units |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | $ 5,700,000 |  |  |  |  |
Bottom of range |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Term used when calculating cash flow projections |  |  |  |  |  | 4 years | 1 year | 3 years |
Top of range |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Term used when calculating cash flow projections |  |  |  |  |  | 6 years | 7 years | 10 years |
Solar panel manufacturing equipment |  |  |  |  |  |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  |  | $ 3,800,000 | $ 3,800,000 |  |  |
Impairment |  | $ 5,200,000 |  |  |  |  |  |  |

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