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Share-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 11, 2017
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Performance Share Units, Vested in Period, Fair Value       $ 43,200,000 $ 13,300,000 $ 7,000,000.0  
Share-based Compensation Arrangement by Restricted Stock Units, Vested in Period, Fair Value   $ 51,800,000 $ 10,200,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       8,500,000      
Stock options outstanding, intrinsic value       $ 0      
Stock options exercisable, intrinsic value       $ 0      
Number of options exercised       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) 24,100,000            
Vesting service 3 years            
Number of stock units outstanding to active and nonemployee directors (in units)       254,300      
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected dividend yield [1]           2.00%  
Stock options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock shares authorized for awards (in shares)       0      
Expected dividend yield       0.00% [1] 2.60% [1]   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] hare options awarded in 2020. Share options awarded in 2019 and 2018 were valued using an expected dividend yield of 2.6% and 2.0%, respectively.