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Discontinued Operations - Additional Disclosures (Details)
$ in Millions
Aug. 16, 2017
USD ($)
May 22, 2017
USD ($)
Dec. 31, 2017
USD ($)
May 23, 2017
USD ($)
Dec. 31, 2016
segment
Discontinued Operations and Disposal Groups [Abstract]          
Number of segments with assets and liabilities classified as discontinued operations (segment) | segment         2
Discontinued Operations, Disposed of by Sale | Drilling Technologies          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash consideration $ 1.0        
Note receivables $ 1.0        
Notes receivable due, period 1 year        
Discontinued Operations, Disposed of by Sale | Production Technologies          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash consideration       $ 2.9  
Escrow deposit       $ 0.4  
Discontinued Operations, Disposed of by Sale | National Oilwell Varco, L.P. | Drilling Technologies          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash consideration   $ 17.0      
Escrow deposit   $ 1.5      
Term of escrow deposit   18 months      
Drilling Technologies And Production Technologies          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Accounts receivable     $ 0.3    
Sales price hold-back     1.4    
Accrued liabilities     $ 1.4