Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 110.1	$ 159.0	$ 201.5	$ 143.8
Foreign currency translation adjustments	[1]	(142.5)	(41.5)	(140.1)	(34.9)
Net unrealized gains on available-for-sale securities
Net unrealized gains arising during the period			(0.8)
Net unrealized gains (losses) on available-for-sale securities	[2]		(0.8)
Net gains (losses) on hedging instruments
Net gain (losses) arising during the period		(43.4)	17.6	(32.2)	42.3
Reclassification adjustment for net (gains) losses included in net income		(3.6)	20.3	(3.4)	54.7
Net gain (loss) on hedging instruments(c)	[3]	(47.0)	37.9	(35.6)	97.0
Pension and other post-retirement benefits:
Net gains (losses) arising during the period		0.4	(1.2)		(1.2)
Reclassification adjustment for amortization of prior service cost included in net income		0.3	0.1	0.3	0.2
Reclassification adjustment for amortization of net actuarial loss included in net income			0.5		0.9
Net pension and other postretirement benefits(d)	[4]	0.7	(0.6)	0.3	(0.1)
Other comprehensive income (loss), net of tax		(188.8)	(5.0)	(175.4)	62.0
Comprehensive income (loss)		(78.7)	154.0	26.1	205.8
Comprehensive (income) loss attributable to noncontrolling interest		(3.8)	5.9	(1.7)	2.2
Comprehensive income (loss) attributable to TechnipFMC plc		$ (82.5)	$ 159.9	$ 24.4	$ 208.0

[1] Net of income tax (expense) benefit of $(0.5) and $(3.2) for the three months ended June 30, 2018 and 2017, respectively, and $(0.5) and $(3.9) for the six months ended June 30, 2018 and 2017, respectively.

[2] Net of income tax (expense) benefit of nil and nil for the three months ended June 30, 2018 and 2017, respectively, and nil and nil for the six months ended June 30, 2018 and 2017, respectively.

[3] Net of income tax (expense) benefit of $12.1 and $(18.7) for the three months ended June 30, 2018 and 2017, respectively, and $8.9 and $(37.3) for the six months ended June 30, 2018 and 2017, respectively.

[4] Net of income tax (expense) benefit of $(0.4) and $0.2 for the three months ended June 30, 2018 and 2017, respectively, and $(0.2) and $0.4 for the six months ended June 30, 2018 and 2017, respectively.