Merger of FMC Technologies and Technip (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended		5 Months Ended	6 Months Ended
		Jan. 16, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition
Merger transaction and integration costs			$ 23.3	$ 16.7		$ 78.0	$ 16.7
FMC Technologies
Business Acquisition
Percentage of business acquired		100.00%
FMCTI Merger
Business Acquisition
FMC Technologies Inc. exchange ratio	[1]	0.5
Merger transaction and integration costs			$ 23.3	$ 16.7		$ 78.0	$ 16.7
Revenues contributed					$ 1,603.8
Net loss contributed					$ (125.6)
FMC Technologies
Business Acquisition
FMC Technologies Inc. exchange ratio		1.0
Technip
Business Acquisition
FMC Technologies Inc. exchange ratio		2.0

[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.