Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 113.7	$ 110.1	$ 133.5	$ 201.5
Foreign currency translation adjustments
Foreign currency translation adjustments(a)	[1]	(22.2)	(142.5)	(1.3)	(140.1)
Net gains (losses) on hedging instruments
Net gain (losses) arising during the period		(10.8)	(43.4)	5.2	(32.2)
Reclassification adjustment for net (gains) losses included in net income		6.7	(3.6)	6.4	(3.4)
Net gains (losses) on hedging instruments(b)	[2]	(4.1)	(47.0)	11.6	(35.6)
Pension and other post-retirement benefits:
Net gains arising during the period		0.5	0.4	1.0	0.0
Reclassification adjustment for amortization of prior service cost included in net income		1.1	0.3	1.4	0.3
Net pension and other postretirement benefits(c)	[3]	1.6	0.7	2.4	0.3
Other comprehensive income (loss), net of tax		(24.7)	(188.8)	12.7	(175.4)
Comprehensive income (loss)		89.0	(78.7)	146.2	26.1
Comprehensive income attributable to noncontrolling interest		(17.3)	(3.8)	(16.9)	(1.7)
Comprehensive income (loss) attributable to TechnipFMC plc		71.7	(82.5)	129.3	24.4
Foreign currency translation adjustments, tax (expense) benefit		0.0	(0.5)	0.0	(0.5)
Net gains (losses) on hedging instruments, tax (expense) benefit		(0.4)	12.1	(0.3)	8.9
Net pensions and other post-retirement benefits, tax (expense) benefit		$ 0.7	$ (0.4)	$ 0.6	$ (0.2)

[1] Net of income tax (expense) benefit of nil and $(0.5) for the three months ended June 30, 2019 and 2018, respectively, and nil and $(0.5) for the six months ended June 30, 2019 and 2018, respectively.

[2] Net of income tax (expense) benefit of $(0.4) and $12.1 for the three months ended June 30, 2019 and 2018, respectively. and $(0.3) and $8.9 for the six months ended June 30, 2019 and 2018, respectively.

[3] Net of income tax (expense) benefit of $0.7 and $(0.4) for the three months ended June 30, 2019 and 2018, respectively, and $0.6 and $(0.2) for the six months ended June 30, 2019 and 2018, respectively.