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Accounting policies - Intangible Assets (Details)
 12 Months Ended
Dec. 31, 2017
Technology and patents | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 14 years
Technology and patents | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 20 years
Tradenames and trademarks | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 20 years
Tradenames and trademarks | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 25 years
Customer relationships | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 10 years
Customer relationships | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 15 years
Backlogs and non-compete agreements | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 5 years
Backlogs and non-compete agreements | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 6 years
Development costs | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 5 years
Development costs | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 10 years
Software | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 4 years
Software | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 7 years