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Business Combination Transactions (Narrative) (Details)
$ in Millions
3 Months Ended 11 Months Ended 12 Months Ended
Apr. 18, 2018
USD ($)
Jan. 16, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 18, 2018
Jan. 29, 2018
Rate
Jan. 29, 2018
Business Acquisition [Line Items]                    
Merger transaction and integration costs         $ 36.5 $ 101.8 $ 92.6      
Goodwill, Purchase Accounting Adjustments         19.7          
Goodwill, Acquired During Period         85.0 $ 5,165.9        
Series of Individually Immaterial Business Acquisitions [Member]                    
Business Acquisition [Line Items]                    
Business Combination, Consideration Transferred         62.5          
Technip Offshore Finland Oy [Member]                    
Business Acquisition [Line Items]                    
Divestitures, Percentage of Voting Interest Sold               100.00%    
Gain (Loss) on Disposition of Stock in Subsidiary     $ 27.8              
FMC Technologies                    
Business Acquisition [Line Items]                    
Percentage of business acquired   100.00%                
Goodwill, Purchase Accounting Adjustments         $ 19.7          
FMCTI Merger                    
Business Acquisition [Line Items]                    
FMC Technologies, Inc. exchange ratio [1]   0.5                
Revenues contributed       $ 3,441.1            
Net income (loss) contributed       $ 251.2            
Business Combination, Consideration Transferred   $ 8,170.7                
Technip                    
Business Acquisition [Line Items]                    
FMC Technologies, Inc. exchange ratio   2.0                
FMC Technologies                    
Business Acquisition [Line Items]                    
FMC Technologies, Inc. exchange ratio   1.0                
Noncontrolling Interest | Island Offshore Subsea AS [Member]                    
Business Acquisition [Line Items]                    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                 51.00% 51.00%
Payments to Acquire Businesses, Gross $ 42.4                  
Goodwill, Acquired During Period $ 85.0                  
[1] As the calculation is deemed to reflect a share capital increase of the accounting acquirer, the FMC Technologies exchange ratio (1 share of TechnipFMC for 1 share of FMC Technologies as provided in the business combination agreement) is adjusted by dividing the FMC Technologies exchange ratio by the Technip exchange ratio (2 shares of TechnipFMC for 1 share of Technip as provided in the business combination agreement), i.e., 1 ⁄ 2 = 0.5 in order to reflect the number of shares of Technip that FMC Technologies stockholders would have received if Technip was to have issued its own shares.