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Share-Based Compensation (Narrative) (Details)
12 Months Ended
Jan. 11, 2017
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
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 | $   $ 13,300,000   $ 7,000,000.0   $ 33,300,000  
Share-based Compensation Arrangement by Restricted Stock Units, Vested in Period, Fair Value | $   $ 10,200,000   $ 4,800,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares   14,400,000          
Stock options outstanding, intrinsic value | $   $ 400,000          
Stock options exercisable, intrinsic value | $   $ 0          
Number of options exercised | shares   0 0     0 0
Proceeds from stock options exercised | €     € 0   € 0   € 0
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            
Vesting service 3 years            
Number of stock units outstanding to active and nonemployee directors (in units) | shares   83,400          
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected dividend yield [1]           2.00% 2.00%
Stock options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected dividend yield   2.60% [1] 2.60% [1] 2.00% [1] 2.00% [1] 2.00% 2.00%
Stock options | TechnipFMC plc Incentive Award Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting service 3 years            
[1]
Share options awarded in 2019, 2018 and 2017 were valued using an expected dividend yield of 2.6%, 2.0% and 2.0%, respectively.