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Mergers and Acquisitions (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 18, 2018
USD ($)
Jan. 16, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jan. 29, 2018
Business Acquisition              
Merger transaction and integration costs     $ 9.0 $ 23.3 $ 14.6 $ 78.0  
FMC Technologies              
Business Acquisition              
Percentage of business acquired   100.00%          
Goodwill, purchase accounting adjustment         19.7    
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