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Discontinued Operations (Additional Disclosures) (Details)
$ in Millions
May 22, 2017
USD ($)
Dec. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Aug. 16, 2017
USD ($)
May 23, 2017
USD ($)
Dec. 31, 2016
segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of segments with assets and liabilities classified as discontinued operations | segment           2
Drilling Technologies | Discontinued Operations, Held-for-sale or Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss on disposal of discontinued operation   $ 1.2        
Production Technologies: | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration       $ 1.0 $ 2.9  
Escrow deposit         $ 0.4  
Notes receivables       $ 1.0    
National Oilwell Varco, L.P. | Drilling Technologies | Discontinued Operations, Disposed of by Sale            
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 assumed     $ 0.3      
Escrow assumed     1.4      
Accrued liabilities assumed     $ 1.4