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Other Charges - Restructuring (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]            
Cash charges       $ 25,100,000 $ 10,700,000 $ 19,500,000
Non-cash charges       3,800,000 21,200,000 4,400,000
Expense of restructuring activities       28,900,000 31,900,000 23,900,000
Impairment $ 0   $ 0   21,200,000 $ 12,200,000
Restructuring provision 12,700,000   $ 6,600,000 $ 12,700,000 6,600,000  
Solar panel manufacturing equipment            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment   $ 5,200,000        
Cost efficiency initiative            
Disclosure of detailed information about property, plant and equipment [line items]            
Expense of restructuring activities $ 8,000,000          
Solar panel manufacturing equipment            
Disclosure of detailed information about property, plant and equipment [line items]            
Impairment         $ 19,000,000