Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 3,323.0	$ 3,143.8	$ 2,960.9	$ 3,125.2	$ 3,683.0	$ 4,140.9	$ 3,845.0	$ 3,388.0	$ 12,552.9	$ 15,056.9	$ 9,199.6
Cost of sales	2,767.7	2,558.5	2,422.2	2,524.6	2,914.1	3,468.2	3,162.0	2,980.3
Net income (loss)	(2,246.5)	134.2	110.1	91.4	(127.5)	117.9	159.0	(15.2)	(1,910.8)	134.2	371.1
Net income (loss) attributable to TechnipFMC plc	$ (2,259.3)	$ 136.9	$ 105.7	$ 95.1	$ (153.9)	$ 121.0	$ 164.9	$ (18.7)	$ (1,921.6)	$ 113.3	$ 393.3
Basic earnings (loss) per share (usd per share)	$ (5.00)	$ 0.30	$ 0.23	$ 0.20	$ (0.33)	$ 0.26	$ 0.35	$ (0.04)	$ (4.20)	$ 0.24	$ 3.29
Diluted earnings (loss) per share (usd per share)	$ (5.00)	$ 0.30	$ 0.23	$ 0.20	$ (0.33)	$ 0.26	$ 0.35	$ (0.04)	$ (4.20)	$ 0.24	$ 3.16