Merger of FMC Technologies and Technip (Acquisition Date Fair Value) (Details) $ / shares in Units, shares in Millions, $ in Millions		Jan. 16, 2017 USD ($) $ / shares shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares
Business Acquisition [Line Items]
Shares subject to exchange (in shares)			465.1	118.9
Euro to U.S. dollar exchange rate		1.0594
Technip
Business Acquisition [Line Items]
FMC Technologies, Inc. exchange ratio		2.0
FMCTI Merger
Business Acquisition [Line Items]
Shares subject to exchange (in shares)		228.9
FMC Technologies, Inc. exchange ratio	[1]	0.5
Shares of TechnipFMC issued (in shares)		114.4
Value per share of Technip (usd per share) | $ / shares	[2]	$ 71.40
Total purchase consideration | $		$ 8,170.7

[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.

[2] Closing price of Technip’s ordinary shares on Euronext Paris on January 16, 2017 in Euro converted at the Euro to U.S. dollar exchange rate of $1.0594 on January 16, 2017.