Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 19.8	$ 91.4
Foreign currency translation adjustments
Net gains on foreign currency translation adjustments(a)	[1]	20.9	2.4
Net gains (losses) on hedging instruments
Net gain arising during the period		16.0	11.2
Reclassification adjustment for net (gains) losses included in net income		(0.3)	0.2
Net gain on hedging instruments(b)	[2]	15.7	11.4
Pension and other post-retirement benefits:
Net gains (losses) arising during the period		0.5	(0.4)
Reclassification adjustment for amortization of prior service cost included in net income		0.3
Net pension and other postretirement benefits(c)	[3]	0.8	(0.4)
Other comprehensive income, net of tax		37.4	13.4
Comprehensive income		57.2	104.8
Comprehensive loss attributable to noncontrolling interest		0.4	2.1
Comprehensive income attributable to TechnipFMC plc		$ 57.6	$ 106.9

[1] Net of income tax (expense) benefit of nil and nil for the three months ended March 31, 2019 and 2018, respectively.

[2] Net of income tax (expense) benefit of $0.1 and $(3.2) for the three months ended March 31, 2019 and 2018, respectively.

[3] Net of income tax (expense) benefit of $(0.1) and $0.2 for the three months ended March 31, 2019 and 2018, respectively.