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EQUITY METHOD INVESTMENTS (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Apr. 08, 2021
Jan. 07, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 30, 2021
Feb. 16, 2021
Dec. 31, 2020
Schedule of Equity Method Investments                    
Investment in Technip Energies     $ 12.8   $ 15.7 $ 20.5 $ 36.8      
Revaluation gain           323.3 $ 0.0      
Investment gain (loss)     (146.8)     323.3        
Investment in Technip Energies     $ 760.0     $ 760.0       $ 0.0
Technip Energies                    
Schedule of Equity Method Investments                    
Equity method investment, ownership percentage                 49.90%  
Purchased shares       7.5            
Purchased value $ 100.0     $ 100.0            
BPI France                    
Schedule of Equity Method Investments                    
Total purchase consideration   $ 200.0                
Technip Energies N.V. | Technip Energies                    
Schedule of Equity Method Investments                    
Equity method investment, ownership percentage     31.10%     31.10%        
Percentage of share capital               15.00%    
Owned (in shares)           55.5