Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss)		$ 91.4	$ (15.2)
Foreign currency translation adjustments(a)	[1]	2.4	6.6
Net unrealized gains on available-for-sale securities
Net unrealized gains arising during the period		0.0	0.8
Net unrealized gains (losses) on available-for-sale securities	[2]	0.0	0.8
Net gains on hedging instruments
Net gains arising during the period		11.2	24.7
Reclassification adjustment for net losses included in net income		0.2	34.4
Net gain on hedging instruments(c)	[3]	11.4	59.1
Pension and other post-retirement benefits:
Net losses arising during the period		(0.4)	0.0
Reclassification adjustment for amortization of prior service cost included in net income		0.0	0.1
Reclassification adjustment for amortization of net actuarial loss included in net income		0.0	0.4
Net pension and other post-retirement benefits	[4]	(0.4)	0.5
Other comprehensive income, net of tax		13.4	67.0
Comprehensive income		104.8	51.8
Comprehensive loss (income) attributable to noncontrolling interest		2.1	(3.7)
Comprehensive income attributable to TechnipFMC plc		$ 106.9	$ 48.1

[1] Net of income tax (expense) benefit of nil and $(0.7) for the three months ended March 31, 2018 and 2017, respectively.

[2] Net of income tax (expense) benefit of nil and nil for the three months ended March 31, 2018 and 2017, respectively.

[3] Net of income tax (expense) benefit of $(3.2) and $(18.6) for the three months ended March 31, 2018 and 2017, respectively.

[4] Net of income tax (expense) benefit of $0.2 and $0.2 for the three months ended March 31, 2018 and 2017, respectively.