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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