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Equity Method Investments (Income (Loss) From Equity Affiliates by Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Income from equity affiliates $ 62.9 $ 114.3 $ 55.6
Subsea      
Schedule of Equity Method Investments [Line Items]      
Income from equity affiliates 59.8 80.9 55.3
Onshore/Offshore      
Schedule of Equity Method Investments [Line Items]      
Income from equity affiliates $ 3.1 $ 33.4 $ 0.3
Technip Odebrecht PLSV CV      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   50.00%  
Technip Odebrecht PLSV CV | Subsea      
Schedule of Equity Method Investments [Line Items]      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 50.00%    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage 50.00%    
Dofcon Brasil AS      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 50.00% 50.00%  
Dofcon Brasil AS | Subsea      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 50.00%    
Serimax Holdings SAS      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 20.00% 20.00%  
Serimax Holdings SAS | Subsea      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 20.00%