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Mergers and Acquisitions (Acquisition Date Fair Value) (Details)
$ / shares in Units, shares in Millions, $ in Millions
Jan. 16, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Dec. 31, 2017
shares
Business Acquisition      
Shares subject to exchange (in shares)   457.5 465.1
Euro to U.S. dollar exchange rate 1.0594    
Technip      
Business Acquisition      
FMC Technologies Inc. exchange ratio(a) 2.0    
FMCTI Merger      
Business Acquisition      
Shares subject to exchange (in shares) 228.9    
FMC Technologies Inc. exchange ratio(a) 0.5    
Shares of TechnipFMC issued (in shares) 114.4    
Value per share of Technip (usd per share) | $ / shares $ 71.40    
Total purchase consideration | $ $ 8,170.7