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Summary of significant accounting policies (Narrative) (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
reporting_unit
Dec. 31, 2015
USD ($)
reporting_unit
Dec. 31, 2014
USD ($)
shares
Property, Plant and Equipment [Line Items]      
Impairment of long-lived assets $ 4,300,000 $ 0 $ 0
Goodwill and Intangible Asset Impairment [Abstract]      
Number of reporting units | reporting_unit 6 6  
Impairment $ 0 $ 123,200,000 0
Estimated useful life, intangible assets 14 years    
Impairment of intangible assets $ 0   $ 0
Earnings (loss) per share      
Diluted earnings per share calculation excluded shares (in shares) | shares     0.5
Subsea Technologies      
Goodwill and Intangible Asset Impairment [Abstract]      
Impairment   123,200,000  
Subsea Technologies | Trade names      
Goodwill and Intangible Asset Impairment [Abstract]      
Impairment of intangible assets   $ 1,900,000  
Minimum      
Property, Plant and Equipment [Line Items]      
Estimated useful life, property and equipment 3 years    
Goodwill and Intangible Asset Impairment [Abstract]      
Estimated useful life, intangible assets 3 years    
Minimum | Trade names      
Goodwill and Intangible Asset Impairment [Abstract]      
Estimated useful life, intangible assets 10 years 10 years  
Minimum | Rental Equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful life, property and equipment 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful life, property and equipment 30 years    
Goodwill and Intangible Asset Impairment [Abstract]      
Estimated useful life, intangible assets 17 years    
Maximum | Trade names      
Goodwill and Intangible Asset Impairment [Abstract]      
Estimated useful life, intangible assets 15 years 15 years  
Maximum | Rental Equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful life, property and equipment 10 years