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Share-Based Compensation (Narrative) (Details)
12 Months Ended
Jan. 11, 2017
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
EUR (€)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2016
EUR (€)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Performance Share Units, Vested in Period, Fair Value | $   $ 7,000,000   $ 33,300,000   $ 7,500,000  
Share-based Compensation Arrangement by Restricted Stock Units, Vested in Period, Fair Value | $   $ 4,800,000   $ 0      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares   18,200,000          
Stock options outstanding, intrinsic value | $   $ 0          
Stock options exercisable, intrinsic value | $   $ 0          
Number of options exercised | shares   0 0     25,500 25,500
Proceeds from stock options exercised | €     € 0   € 0   € 1,500,000
Stock option exercised during period, intrinsic value | €     € 0   € 0   € 0
TechnipFMC plc Incentive Award Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock shares authorized for awards (in shares) | shares 24,100,000.0            
Vesting service 3 years            
Number of stock units outstanding to active and nonemployee directors (in units) | shares   119,400          
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected dividend yield   2.00% 2.00% 2.00% 2.00%    
Stock options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected dividend yield       2.00% 2.00%    
Stock options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected dividend yield       4.50% 4.50%