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Business Combination Transactions (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 18, 2018
USD ($)
Jan. 16, 2017
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jul. 18, 2018
Jan. 29, 2018
Business Acquisition                
Merger transaction and integration costs     $ 6.3 $ 9.2 $ 20.9 $ 87.2    
FMC Technologies                
Business Acquisition                
Percentage of business acquired   100.00%            
Goodwill, purchase accounting adjustment         19.7      
Technip Offshore Finland Oy                
Business Acquisition                
Divestitures, Percentage of Voting Interest Sold             100.00%  
Gain (Loss) on Disposition of Stock in Subsidiary     $ 27.8          
Series of individually immaterial business acquisitions                
Business Acquisition                
Goodwill, acquired         0.5      
Consideration transferred         $ 61.0      
Technip                
Business Acquisition                
FMC Technologies Inc. exchange ratio   2.0            
FMC Technologies                
Business Acquisition                
FMC Technologies Inc. exchange ratio   1.0            
Non- controlling Interest | Island Offshore Subsea AS                
Business Acquisition                
Redeemable noncontrolling interest, acquired percent               51.00%
Cash consideration $ 42.4              
Goodwill, acquired $ 85.0